Horror movies come in all shapes and sizes.

You've got your comedy horrors, your psychological horrors, your tense thriller-y horrors — and, of course, your genuinely scary horrors.

I'm not just talking about your run-of-the-mill, yikes-that's-a-bit-creepy kind of films, here, either. I'm talking about the truly terror-inducing — the type of movies you wake in the dead of night thinking about, and which stay with you for a long, long time after the credits have rolled. The horribly twitchy, sleep-with-the-lights-on-and-avoid-all-mirrors kind of movies.