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'The Faculty' (1998)
Why it's horrifying: Because it can be hard enough to relate to teachers under normal circumstances, and now they've been taken over by weird, gross aliens. And everyone talks like they're in a movie written by Kevin Williamson. Although, on the plus side, your classmates look like Josh Hartnett, Jordana Brewster and Clea DuVall. It might be worth it.
Most traumatic moment: John Stewart, seemingly the nicest guy in the world, plays an infected science teacher who attacks nerdy Elijah Wood. Josh Hartnett -- sporting the worst haircut of his career -- chops of the Stewarts's fingers, only for the severed digits to crawl all over the floor and the students' bodies. Inappropriate.
- Dave Lewis