The Exorcist was not so much scary as it was disturbing to me - too close to reality. It shows what you can open up when you dabble with the unknown (i.e. Ouija boards).
I caught "Stir of Echoes" in the middle where Kevin Bacon sees the spirit of the young girl standing in the door way and that scared the daylights out of me. The way she moved towards him was the creepiest.
I've heard people say "Stigmata" was scary, but it wasn't to me. I actually liked the movie. Again, it had some disturbing parts, but not scary.
And finally, I love "Event Horizon" and "End of Days" (even though they don't scare me).
Now, I once read a book called 666 (?) and it scared me so badly that I threw the book on the floor (and I don't scare easily).
[This message has been edited by tickledpink (edited June 14, 2001).]