Movies that freaked me out... hmmm..
I totally agree with you, ineverysunflower, 28 Days Later really bothered me. I actually walked out, to be honest. Not because of the zombies, but because of the scene where the marines are about to rape the women.. that was WAY too much for me.
Derailed bothered me a lot as well. I REALLY hate rape scenes in movies, and I felt that that movie totally trivialized that for me. I found it to be highly offensive.
When I was little, Return to Oz scared me shitless.. that queen with the cabinets full of heads? the wheelers? TOTALLY traumatizing.