What is the scariest movie you have ever seen?

It's funny, when I was a small child, the exorcist scared me so badly, I didn't sleep or a week. I also remember EVIL DEAD freaked me out! I recently watched both, and for their time, I think they were still impressive. Today's horror - no stone is left unturned. HOSTEL although it was a Boobfest, it was clever and had me crinking at the edge of my seat. I'm a fan of the suspense horror genre - The Sixth Sense or Room 1408 (highly recommendly) What's your scariest movie?