The Exorcist wasn't really scary. It's fucking great though :thumb:
My personal favourite scary moments are in:
The Exorcist III - there's this one scene that really scared me for a bit.
Rosemary's Baby - right at the end, when you see Rosemary making a phone call and there are people slouching behind her to the cupboard.
The Omen - the scene on the graveyard, when they find the jackal body.
The Shining - whenever that kid rides around his tricycle.