Exorcism of Emily Rose scares the piss out of me.
I just watched
The Abandoned yesterday and that one too scares me. It isn't one of those that makes me afraid of the dark but it did give me the shakes in the dark.
Right now I am composing a list of movies that remind to be scared of the dark, the afterlife, and the unknown. I am glad that I am not resurrecting this thread too much.