Favorite Scary Movies

Everyone likes to watch scary movies on Halloween right? Scary movies are different people.

Scary movies to me have nothing to do with scifi. The scariest movies of all to me are the ones that could really happen. For example my favorite scary move is "When A Stranger Call" or a movie like "The Stranger." Those things could really happen. Even some of the things in "Urban Legend."

What is your favorite scary movie?