My Top 10 Most Disturbing Horror Movies

Keep in mind, even though I have seen almost 500 horror movies, I haven't seen everything that exists.
Let me know what your Most Disturbing Horror Movie Of All Time is.
SPOILERS
Movies (In order):
Megan is missing
A Serbian Film
August Underground's Mordum
The Human Centipede 2 (Full Sequence)
Cannibal
Salò, or the 120 Days of Sodom
Tusk
Martyrs
The Poughkeepsie Tapes
August Underground
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