I know alot of people who have a serious fear of clowns. Most of them say it was because they watched Stephen King's "IT". Also have seen it mentioned on various talk shows. It freaked me out back then, but I can go to the circus nowdays without crapping myself.
So my question is: What movies freaked you out growing up, or even now.
I'll start off with my answer. "In the Mouth of Madness" That one messed with my head after I saw it.
my wedding tape scares the hell out of me.

no really it does.
House on Haunted Hill gave me nightmares for years as a child.
As a kid the classic Invasion of the Body Snatchers could put a scare into you....but saw a great film as an adult called The Changling that scared you pretty good.
When i was young a friends parents had a pirate copy of 'The Exorcist'......i was so scared