1 kg ETN (Erythritol Tetranitrate) Explosion

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  • čas přidán 10. 09. 2024
  • A detonation of 1 kg (1000 g) ETN
    1 kg of ETN (1000 g) is approximately equal to 2.2 kg ANFO (calculating with RE factor)
    What is burning at 2:30?
    DISCLAIMER: This video is for educational purposes only. Refrain from replicating any acts shown in the video, as they could lead to fatal consequences, severe injuries, or legal repercussions.

Komentáře • 175

  • @jordanhess2061
    @jordanhess2061 Před 10 měsíci +10

    OHY GOODNESS, that is a huge chunk of ETN.
    I love it, I love all of it.
    Great job 👍👏👍🎉😂🎉

  • @jeffjefferson2676
    @jeffjefferson2676 Před rokem +39

    Well done. ETN is pretty easy to make, and has a high RE factor. It really eats everything around it and shreds it to pieces. If you want a louder bang, and blow more stuff up, you want powdered aluminum that is finer than 100 micron. To set it off better, you want to add some sulfur powder too. Potassium perchlorate, can do a lot, but its hard to attain.
    Yes really cool!
    Greetings,
    Jeff

  • @TheCrapOnYourStrapOn
    @TheCrapOnYourStrapOn Před rokem +6

    You have more cameras than my mothers bathroom

  • @alessandrotozzi9246
    @alessandrotozzi9246 Před rokem +47

    Try adding 15% by weight of magnesium powder.

    • @vitox_pvp6368
      @vitox_pvp6368 Před 9 měsíci +6

      Why ?

    • @sEXPLO5
      @sEXPLO5 Před 9 měsíci +12

      ​@@vitox_pvp6368ETN has an excess of oxygen so people want to add metal. would sensitize it more and have other issues

    • @vitox_pvp6368
      @vitox_pvp6368 Před 9 měsíci

      @@sEXPLO5 is it really better ?

    • @alessandrotozzi9246
      @alessandrotozzi9246 Před 8 měsíci +10

      @@vitox_pvp6368 Because magnesium increases the heat of explosion, generating more power.

    • @vitox_pvp6368
      @vitox_pvp6368 Před 8 měsíci

      @@alessandrotozzi9246same with aluminium

  • @bingewatcher2769
    @bingewatcher2769 Před 2 lety +3

    Man i am so fan!!!! I miss your vidéos a lot!! Please come baaaaack

  • @baloog8
    @baloog8 Před 7 měsíci +4

    How many camera angles would you like?
    Yes..

    • @appatula
      @appatula Před 2 měsíci +1

      5 or 6 with 1kg ETN please....

  • @trinitro5968
    @trinitro5968 Před 11 měsíci +7

    Never the less! Wow over 2lbs of ETN! How long did it take you to make this amount?

  • @jankastelec7579
    @jankastelec7579 Před 2 lety +8

    Damm nice boom, but if I had 1kg of ETN, i would place it in 50kg of prilled anfo. Grear job 👍👍

    • @Muvahhid_054
      @Muvahhid_054 Před 9 měsíci

      Как приготовить ANFO??? Помоги пожалуйста буду благодарен

    • @romangurman7792
      @romangurman7792 Před 5 měsíci

      ​@@Muvahhid_054
      94% NH4NO3
      6% Дизеля

    • @federicodeluca3748
      @federicodeluca3748 Před 3 měsíci

      :D

    • @anotherguy-ix1ol
      @anotherguy-ix1ol Před 23 dny

      @@Muvahhid_054 ammonium nitrate+Diesel fuel 90/10

    • @KzEli2023
      @KzEli2023 Před 23 dny

      @@anotherguy-ix1olбрат получается берешь 90 г аммоний нитрат + 10 мл дизеля и перемешиваешь?

  • @michaelevripiotis6042
    @michaelevripiotis6042 Před 2 lety +7

    Great to see what 1kg does, that muted my 50g test so far 🤣
    It would be interesting to see 1kg of TACN detonated due to its easy synthesis.

  • @seventeenshaun6424
    @seventeenshaun6424 Před 8 dny

    ETN!? Not even PETN?! This guy is fucking nuts!

  • @John-ir2zf
    @John-ir2zf Před měsícem

    You went with "hand pack" density ?
    Should have melted that bucket (carefully of course).
    Youd pretty much double the DT velocity.
    Still a nice bang, but ive seen half a pound of melt cast crater the ground like that.

  • @user-gs5en5gb4u
    @user-gs5en5gb4u Před 8 měsíci +1

    Its full power is not activated, I think it is less than 50 percent

  • @Gole-zf6xm
    @Gole-zf6xm Před 2 lety +2

    Good video, next time put objects to see the damage of explosion with more details

  • @trinitro5968
    @trinitro5968 Před 11 měsíci +1

    I would have expected so much more! 2.2 lbs of this? Even 20 to 30 grams, of this is sufficient to bore a hole through steel!

    • @vitox_pvp6368
      @vitox_pvp6368 Před 8 měsíci

      Thé explosion is very big what did your espect a nuclear bomb

    • @John-ir2zf
      @John-ir2zf Před měsícem

      This etn was the "hand pack" density....looked like it was put in the bucket wet after recrystallization and allowed to dry.
      Had it been melt casted, it would have had twice the detonation velocity and wouldn't have looked like white powder anymore.

  • @neilposs4981
    @neilposs4981 Před rokem +1

    How did you initiate?

  • @alqaeda308
    @alqaeda308 Před 2 lety +5

    Please tutorial

  • @KClO3
    @KClO3 Před 2 lety +5

    discord, signal or telegram you have?

  • @Bert2368
    @Bert2368 Před rokem +2

    That was snappy.
    How was the ETN purified?

  • @amirmosafer9438
    @amirmosafer9438 Před 2 měsíci

    Strong . . .

  • @XtremeHero
    @XtremeHero Před rokem

    what did you think about a strong flash powder beeing the initial detonator for [ANFO] or [ANSAL] ? I know people are saying that one powerfull detonator wont do the job right ? and that ANFO needs some booster charge. But what can someone like me, who doesnt can make higher stuff than ANFO, use for the booster ? Or the bether question is, what kind of Detonator and Booster can i use for ANFO, which is on the same level or lower than ANFO. ?
    I would be very happy about an answer.😊
    For scientific purposes only , of course.

    • @istvanff
      @istvanff Před 9 měsíci +1

      Stroke

    • @IIIAnchani
      @IIIAnchani Před 9 měsíci

      do NOT mix perchlorates with anything containing ammonium nitrate. Simply don't.

    • @vitox_pvp6368
      @vitox_pvp6368 Před 8 měsíci +1

      Anfo need strong détonation to have a complete explosion flash powder will not work you need a high explosive

    • @XtremeHero
      @XtremeHero Před 7 měsíci

      @@vitox_pvp6368 what would you choose as a good detonator ?

  • @sandipmridha6497
    @sandipmridha6497 Před 5 měsíci

    ETN Used as booster charge?

  • @TheFireGoose
    @TheFireGoose Před 2 lety +2

    Very epic. did you use a detonator for this, if so what type?

    • @OctaNitroPyro
      @OctaNitroPyro  Před 2 lety +7

      Yes, a time-fuse initiated detonator with around 150 mg SADS and 750 mg ETN was used

    • @jeffjefferson2676
      @jeffjefferson2676 Před rokem

      @@OctaNitroPyro I found that silver double salts had trouble setting off the ETN. Did you mix the two? I found that mixing the ETN with 1 or two match heads that were powdered gave reliable detonation. I used Christmas tree lighting and a straw for the blasting cap.
      Greetings,
      Jeff

    • @TheFireGoose
      @TheFireGoose Před rokem

      @@jeffjefferson2676 really? I use Sads like they do and it works wonderfully when it comes to initiating ETN. While I normally only use smallish amount of ETN when I want to blow something up (1-3 gr), 150mg can easily set it off. I usually fill a tiny snap cap vial with a small hole punched in the lid (I think .5ml) up with Sads and stick a fuse through the hole to initiate the Sads. It works very well and reliably to set off ETN, and could if scaled up a bit, set off some chlorate/AN based mixes. If it isn’t working well for you, make sure your SADS is pretty pure and very dry. If even a tiny bit of moisture is present it can drastically weaken it. Also make sure your ETN is pure.

    • @jeffjefferson2676
      @jeffjefferson2676 Před rokem +2

      @@TheFireGoose Dry or not, it was too weak. I used recrystallized ETN, so its very pure. The matchheads made for more reliable of a detonator. The christmas light and a staw is a pretty good detonator, use toiletpaper and parrafine pellets to close the ends off, and some electrical tape. I like electric caps better. 0.15g of double salt silver explosive, and 0.5 gram of ETN was pretty good, but it needed the match head powder before it would be reliable enough. Some 30 gram of sawdust in a baggy, with 5ml of nitroglycerine can set every sort of exlodive off. If you put everything (detonator and booster) in a small vitamine jar it is pretty sturdy. I have not tried adding aluminum powder (smaller than 100 micron) to the sawdust, but it could make for a much more potent booster charge. Ive also read that adding sulfer powder can aid in combustion of ammonium nitrate aluminum and sulfur rocket engines. So it may be worth it to add that to the sawdust too. It should make for some cheap thermobaric explosive. Explosive making is pretty labor intensive. Also be sure that you do not have any hard objects around your explodion that could form a projectile. So no papermache and steel punchings... Its only for fireworks... Not to mention LoRa WAN modules, but these can be very safe for remote detonations, when an arduino is added you can put a password on your explosive. Much safer than a mobile phone.....
      So only funy, and not terrorist nonsense, heaven is here on earth. Not in the fantasy.
      Greetings,
      Jeff

    • @TheFireGoose
      @TheFireGoose Před rokem

      @@jeffjefferson2676 ok very cool. If the matchheads work to improve reliability that’s very good. I also like the idea of using Christmas light bulbs, very jolly :)
      I have a question though. So when you make your nitroglycerin do you use nitric and sulfuric acid or a nitrate salt and sulfuric acid, and also how much. I recently made some nitroglycerin with 50ml of sulfuric acid and 20ml of 68% nitric acid, and then maybe 2.5ml of glycerin, but when I crashed everything out and went to pippete the nitro, there really wasn’t very much. it seems quite expensive to to do it this way, since I have heard that you only get 1ml of nitroglycerin per 10ml of nitric acid. How do you do it? And is there a more economical way to make it, especially in larger amounts? Thanks :)

  • @MuhammadAli-us1lw
    @MuhammadAli-us1lw Před rokem

    how did you make

  • @d.olivia8431
    @d.olivia8431 Před rokem +1

    Is that an equivalent to a mortar impact?

  • @محمد-ك2ذ
    @محمد-ك2ذ Před 2 měsíci

    How to make ?

  • @DanaWebb2017
    @DanaWebb2017 Před 2 lety

    If you took a small amount of Erythritol Tetranitrate, put it on an anvil, and hit it with a hammer, would it detonate?

  • @RotaryMarx
    @RotaryMarx Před rokem +1

    Its still science cause you recorded it

  • @kirchofffontaine6845
    @kirchofffontaine6845 Před 10 měsíci

    Dude wher did you get 1kg ETN ?

    • @Beinwong
      @Beinwong Před 5 měsíci

      Online Ilegal store (dark web)

  • @beavischrist5
    @beavischrist5 Před 7 měsíci

    Lot of work, distilling nitricacid, nitrating, washing. Etc. Unless you have a lange nitrating kettle😅

  • @maxbuust8670
    @maxbuust8670 Před 4 měsíci

    Is that some slow flash powder?

    • @jangokarambo6543
      @jangokarambo6543 Před 3 měsíci

      Bro thats an 8200 Meters per secound high explosive

  • @user-jr3bz4ce2r
    @user-jr3bz4ce2r Před rokem

    I'm curious about what country you are in ,Is it because you have obtained any legal certificate?

  • @KClO3
    @KClO3 Před 2 lety +1

    wow impressive, i have to ask you if you can try something, basically 5-10kg flash powder in spherical container for a mockup of nuclear explosion, let me know what you think

    • @OctaNitroPyro
      @OctaNitroPyro  Před 2 lety +1

      It does indeed sound like it would be interesting to see if a flash powder explosion could replicate a nuclear explosion, but it sadly sounds pretty expensive because atleast a few kgs of aluminium powder would be needed. Also there seems to be quite many videos about large flash powder explosions already, so its something I probably wont make.
      To answer your other question, as of right now I dont have a telegram or discord.

    • @KClO3
      @KClO3 Před 2 lety +1

      @@OctaNitroPyro could you create an account somewhere, I really would like to talk outside of comments because it's quite hard this way

    • @KClO3
      @KClO3 Před 2 lety

      @@OctaNitroPyro by the way why do you check on comments so rarely? Like only when a new video is uploaded?

    • @dudetapedtoafridge3073
      @dudetapedtoafridge3073 Před 2 lety +1

      The oftler has a few videos with absolutely enormous flash powder explosions. I saw a vid where they just took a barrel and filled it with salute shells and it was a literal bomb. Just not in a spherical container. Also large flash salute shells can contain as much as 3 kg

    • @KClO3
      @KClO3 Před 2 lety

      @@dudetapedtoafridge3073 yeah it was big however the explosion could of been better, without all the paper and plastic in-between and rather pure flash would be much better, plus it needs to be in a spherical container with central ignition supported in the air by a platform. Look up on yt "trinity 100 ton tnt test" now imagine a human sized mockup of that using flash. Mockup of a mockup of a nuclear explosion lol

  • @John-jj8jc
    @John-jj8jc Před 2 lety +1

    Largest ETN detonation on youtube great job. Is it melt cast at max density 1.7g/cm^3? If yes, did you hand press it first in the container and melt it using the classic water bath method?

    • @OctaNitroPyro
      @OctaNitroPyro  Před 2 lety

      No, it is only hand pressed

    • @John-jj8jc
      @John-jj8jc Před 2 lety +2

      @@OctaNitroPyro As you can see here czcams.com/video/OsxeBWkMf30/video.html , melt casting it makes a night and day difference in power. It could be quite dangerous to melt cast such a large amount though so i would prefer hand pressed unless you have some kind of pulley system to lower the ETN in the hot water bath from far away and then just let it sit until the water cools and return several hours later. Regarding the actual ETN, did you make it all in one batch, if so, did you notice the fact that when you pour the reaction mixture of batches larger than 30 grams yield in water the water starts heating up, and if you don't use enough water it'll eventually start a runaway, violently emmitting nitrogen dioxide? I've come accross this twice and thankfully i drowned it with water before anything happened but still. I will use like 8 liters of water to crash out the ETN for 120 gram yield batches now just to be safe from that.

    • @KClO3
      @KClO3 Před 2 lety

      @@OctaNitroPyro have you read my comment?

    • @trinitro5968
      @trinitro5968 Před rokem

      @@KClO3 hands down! Biggest ETN detonation! MY question is how many batches did you make to get 2.2 pounds? This must have taken at least a couple of weeks to prepare! Dude nice job, I'm always reading and searching for new articles about ETN, etc. I See certain websites and there research, labeling the makers, as bomb makers and terrorists. It's sad, because these people have no clue! For the amature enthusiasts, this is a major mile stone , in creating something from a common, available substances. This is research , our science as we know it, and take pride in. This is not about destruction, or terror or lawlessness, or to harm anyone. It is about creating something, that when not used for any negative way, allows someone to feel accomplished, gives way for new innovation, whether publicized or not, this is something you have created. In a perfect world, this would not be restricted by law.

    • @jeffjefferson2676
      @jeffjefferson2676 Před rokem

      @@OctaNitroPyro I would not dare to press this. I can say that if you have pure paraffin (important!), you can desensitize the ETN, and cast it.
      Greetings,
      Jeff

  • @user-pu6ul3xf3g
    @user-pu6ul3xf3g Před 17 dny

    No etn

  • @casf-airsoft
    @casf-airsoft Před rokem

    Where can i buy ETN in Europe?

  • @karolus28
    @karolus28 Před 2 lety

    cool

  • @riteshthakur8358
    @riteshthakur8358 Před 2 lety +3

    This one is impressive. Is etn safe to handle as compared to nitroglyc explosive just asked as it appears you used it easily

    • @albatross_v2
      @albatross_v2 Před 2 lety +5

      etn is less sensitive than nitroglycerin

    • @TheExplosiveGuy
      @TheExplosiveGuy Před rokem +2

      In more ways than one, it's _way_ less sensitive than NG and does not cause splitting headaches when handled since ETN *edit-* _is_ -not- a vasodilator, but unlike NG is not quickly absorbed through the skin *-end of edit.* ETN is pretty good stuff actually.

    • @ajofmars2579
      @ajofmars2579 Před rokem +4

      @@TheExplosiveGuy Just a slight correction, etn is still a powerful vasodilator, it just isn’t absorbed through the skin, so it’s safe to handle in that regard. Just don’t nibble on your explosives people, slightly less safe.

    • @TheExplosiveGuy
      @TheExplosiveGuy Před rokem +1

      @ajofmars2579 Good to know, thanks for the correction. It's a good thing I don't taste test my EM's lol.

    • @tabletdrone6841
      @tabletdrone6841 Před 11 měsíci +1

      @@TheExplosiveGuy That's completely WRONG information you're disseminating. ETN is very much a vasodilator. They have used it interchangeably with glycerin trinitrate since the 1950's under the trade name "nitroglyn". Play with ETN without gloves and pay the price, but don't lead other people to places you no so little about, that's some pure ignorance and the bane of our crumbling society. Study on, and good luck

  • @fudes587
    @fudes587 Před rokem

    Can i make it with hydrochloric acid?

  • @RavenK19
    @RavenK19 Před rokem

    what detonator?

    • @TheFireGoose
      @TheFireGoose Před rokem +1

      He said it was 150mg sads and 750mg ETN

    • @RavenK19
      @RavenK19 Před rokem

      @@TheFireGoose do you make the detonators yourself or is it possible to buy them somewhere from you?

    • @TheFireGoose
      @TheFireGoose Před rokem

      @@RavenK19 Unless you have a bunch of silly licences, you pretty much always have to make your own detonators. It's really easy though and there are soooooo many ways to do it.

    • @RavenK19
      @RavenK19 Před rokem

      @@TheFireGoose maybe yes, but I'm not a chemist and I don't dare to use explosives, I have experience with flash powder, but it's weaker than explosives

    • @TheFireGoose
      @TheFireGoose Před rokem +2

      @@RavenK19 if you just do a lot of research and be careful and respectful around energetic compounds you’ll be just fine. I’m completely self taught and now have a very deep and thorough understanding of all things that go boom.
      If you wanna start making HE’s I’d recommend starting small and safe, make things like ETN and picric acid for secondary’s. Make things like silver acetylide or CHP for primaries (stay away from organic peroxide’s for now, even though they are super easy to make, they are really NOT for beginners), and if you want you could even try some AN or chlorate based mixes for larger charges. Sciencemadness is a great place to learn things, so is CZcams. So if you do actually want to get into this, then take some time to do all the research you need then go from there.

  • @nenglia6137
    @nenglia6137 Před 7 měsíci

    Dirty etn more powerfull than recristalitation etn

  • @user-eh7zc8be7i
    @user-eh7zc8be7i Před 2 lety +1

    That was exciting, do you think 1kg of acetone peroxide is more powerful or 1kg of etn?? The answer to this question is valuable for me.

    • @NCTDrones
      @NCTDrones Před 2 lety

      TATP is less powerful than ETN by about 65% (from Wikipedia)

    • @user-eh7zc8be7i
      @user-eh7zc8be7i Před 2 lety

      @@NCTDrones Thank you for your answer. In a clip, I saw tatp combining nitro starch and acetone with the respective percentages of tatp 3%, starch 2% and acetone 1%, do you think this new combination will be more powerful than tatp? And basically, what way do you suggest to make tatp stronger? I would be very grateful if you could help me.

    • @NCTDrones
      @NCTDrones Před 2 lety

      @@user-eh7zc8be7i I don’t think the power would increase too much but I would advise against making TATP because you are probably going to die

    • @fudes587
      @fudes587 Před rokem +4

      @@user-eh7zc8be7i dont make tatp

    • @TheExplosiveGuy
      @TheExplosiveGuy Před rokem +5

      1 kilo of ETN is much more powerful than acetone peroxide and about ten times safer, don't ever make more than a few grams at a time if at all. ETN is just as easy to make with just as easily obtained ingredients as AP, easier even since the ingredients can mostly be found at the grocery store. But honestly, if you like big charges just stick with ammonal mixed on site, it's far safer than large quantities of primaries and will get you in a lot less trouble.

  • @frankdelahue9761
    @frankdelahue9761 Před 11 dny

    HMX.

  • @Muvahhid_054
    @Muvahhid_054 Před 9 měsíci

    Скажите пожалуйста как приговорить ANFO

  • @ГондурасМексиканский

    Density with pib 4% etn 96% give~1.6gr/cm3.

    • @JW-zs9bk
      @JW-zs9bk Před 2 lety

      Твердая хреновина получится. Тогда ушш просто пвв лчш.

    • @ГондурасМексиканский
      @ГондурасМексиканский Před 2 lety

      Как промежуточник самое то, высокая плотность =высокая с.д..Короче заводилка это для всяких тугих составов.Конечно это очень отдаленно напоминает пвв но в 5см3 баяне легко прессуется до 1.6.С ведром такой номер не пройдёт,да и нах?

    • @JW-zs9bk
      @JW-zs9bk Před 2 lety

      @@ГондурасМексиканский у меня выходило чем тверже пвв тем хуже характеристики.

    • @ГондурасМексиканский
      @ГондурасМексиканский Před 2 lety

      Не ну с этн этого не должно быть.Конечно, если внести намеренное кол-во пиб или другой лабуды то ,возможно и выйдет значительное снижение вв характеристик.Но так этн с 4-5%пиба лупит будь здоров.PDT фактически как у пентолита.

    • @JW-zs9bk
      @JW-zs9bk Před 2 lety

      @@ГондурасМексиканский этн нужно еще сделать мелкие частицы. Шо за pdt?

  • @imtarat
    @imtarat Před rokem

    how to make tatp?

    • @theriperkiller
      @theriperkiller Před rokem +1

      dont make TATP

    • @imtarat
      @imtarat Před rokem

      @@theriperkiller why?

    • @theriperkiller
      @theriperkiller Před rokem +1

      @@imtarat very sensitive and dangerous if u wanna try to make it u need 1.hydrogen peroxide 2.acetone 3.HCL to make it

    • @imtarat
      @imtarat Před rokem

      @@theriperkiller thanks bro,u can give me instagram?

  • @user-wg7ds8mz8n
    @user-wg7ds8mz8n Před 2 lety +2

    Can tatp detonate etn?

  • @piercehamilton7035
    @piercehamilton7035 Před rokem

    DO TATP!!!

  • @madkem1
    @madkem1 Před 2 lety

    Jesus Christ lol. Subscribed

  • @nehorlavazapalka
    @nehorlavazapalka Před 2 lety +2

    This was a total waste of resources, money and time. You'd get a bigger explosion just from the AN that went in. In fact, 1 kg of ETN is about 1.2 kg of 80/20 ammonal in terms of air blast (and about a 1/4 of your blast went into the ground). And much nicer fireball. You should have gone thermobaric (~ 30 % Al) or use it on steel/stone to see the brisance.

    • @asherlehman7031
      @asherlehman7031 Před 2 lety +2

      assuming NH4NO3 and h2so4 are cheap and erythriol costs 10$/kg and aluminum powder costs 20$/kg, then ETN/Al costs 30% less than AN/Al and is 15% weaker thermodynamically, but detonates 2x faster, so ETN/Al has more bang for your buck.
      If you just want a bigger explosion you can just use ANFO that is 3x cheaper than both, but if you want a greater velocity of detonation, then it doesnt have any sense to use AN/Al, thats why no millitary or industry uses it, they either use ANFO for breaking rocks, or PETN, RDX, HMX for breaking steel, and ETN/Al is about the same as the latter

    • @asherlehman7031
      @asherlehman7031 Před 2 lety +1

      @North Stubh I am just saying that the most cost effective thing is using either ammonium nitrate with the cheapest fuel you find, or if you want a higher velocity of detonation, using it to make a nitroester like ETN, if ETN/Al is too sensitive then you can use ETN with any organic fuel, but ammonium nitrate with aluminum is very expensive, and slow, and not worth it just because it releases a little bit more energy

    • @vitox_pvp6368
      @vitox_pvp6368 Před 8 měsíci

      Adding aluminium makes it thermobaric ? But you dont mix them you put the additionnal al on top of the ammonal or it cant go thermobaric

  • @musabsarjo
    @musabsarjo Před 6 měsíci

    I think that videos like this should not be on CZcams. Children may see them. This is very dangerous

  • @Muvahhid_054
    @Muvahhid_054 Před 9 měsíci

    Пожалуйста

  • @slobodanvasilijevic7784
    @slobodanvasilijevic7784 Před 6 měsíci

    Ovo ko petarda