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Blair Witch was not scary to me at all. The whole runny-nose-in-the-flashlight was actually quite funny.
I don't find much entertainment in slasher films, and have successfully stayed away from the Friday the 13th series (sequels 1 - 135). Nightmare on Elm Street was fair, the sequels were full of shoddy makeup. Freddy went from looking burnt to looking like an oozing blister.
Scariest movie in terms of sheer FEAR? The Ring. I still have flashes of that darn little girl.
Most disturbing? The Exorcist.
Most Mind-Twisting? Clockwork Orange.