Books: IT, The Shining, and Amityville Horror (don't laugh - I was 13 when I read it and it was before I found out it was basically a hoax).
Movies: I have several that are either scary, really creepy, or both - Burnt Offerings, original Paranormal Activity, The Changeling, Sixth Sense, and Legend of Hell House.
My favorite Halloween movie: Young Frankenstein
I love Halloween!