What's your favorite scary movie?

In addition to the poor box office performance of The Real Cancun, my faith in movies has also been restored by Identity. Although not quite as well-crafted as The Sixth Sense, the film has a brilliant twist about 2/3 through, and a clever twist at the very end. It also scared the shit out of me. And with nary a false scare, tepid chase scene, or gory death, the movie's spookiness rests on the laurels of its psychological screenplay, creepy setting and adept cast. And, without giving away any plot points, small children are scarier than the seventh circle of Hell.