The only part of the Exorcist that scared me was the scenes where Regan was going through all the diagnostic testing.

I don't do "slasher" films, blood and gore do not a good movie make.

The film that scared me the most was Seven. The first time I saw it I was horrified. (For those who have not seen it, it is about a serial killer, each victim reflects one of the 7 deadly sins) I haven't been able to watch it a second time.