My Top 10 Horror Movie Twists

Keep in mind, even though I have seen almost 500 horror movies, I haven't seen everything that exists.
Let me know what your favorite Horror Movie Twist of all time is.
SPOILERS
Movies (In order):
I Spit on Your Grave
Get Out
Malignant
Orphan
Devil
Saw II
Final Destination
Cabin Fever
Oldboy
Saw
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