10 Scariest Movies That Aren't Horror

Darren Aronofsky's Requiem for a Dream demonstrates the soul-destroying perils of drug addiction in deeply disturbing yet utterly hypnotic fashion.

Luring audiences in with its stylish filmmaking and especially its razor-sharp editing, Aronofsky's movie nevertheless offers no fun times or easy respite for its beleaguered central characters, each of whom is on an unavoidable path towards annihilation in one form or another.

Perhaps more than any other film ever made, Requiem for a Dream forensically details how drug abuse can erode a person's sense of self and boil them down to the all-consuming pursuit of another fix.

Jared Leto, Jennifer Connelly, Marlon Wayans, and especially Ellen Burstyn - who received a Best Actress Oscar nomination for her work - turn in sublimely heartbreaking performances, teasing out the existential horror of dependence. And by the time it's all over, you'll feel more shook than by 99.9% of actual horror movies.