Hmmmm...
Haven't seen many scarey movies in a while. Let's see...
"Stigmata" didn't bother me. "Hannibal" was just gross, not scarey. "What Lies Beneath" had me looking between my fingers at the movie screen, but it didn't leave me with the jitters.
I guess I'll have to go back a few years and say "Amityville Horror". Though it's not very scarey to me now, it scared the CRAP out of me then. I constantly found myself looking out windows at night to see if there were any disembodied eyes floating outside, looking in.