T.O.D.
Books
I think the scariest book I have ever read is GHOST STORY (or GHOUST STORY in England) by Peter Straub. Unfortunately, the movie was good, but it didn't live up to the terror of the book. Still, having Fred Astaire, Melvyn Douglas, Douglas Fairbanks, Jr., and John Houseman was pretty cool; with a brief bit of full frontal nudity from Craig Wasson.
THE EXCORCIST by William Peter Blatty. I made th mistake of seeing the fim before I read the book, so when I read it, all of the horror of the film carried over. My bedroom had been converted from an old porch, so the light switch was clear across the room from my bed. One night I said, "Screw it," and slept with the light on,