Mmmm, I love horror films!

The Exorcist (scares me everytime I watch it)
Night Gallery (spooky!)
The Omen (original)
Saw 1 and 2 (so friggin sick, I love it)
I love most Dracula movies
Oh The Amityville Horror (the second one used to scare me)

The Shining is awesome too.
Oh and Psycho is a classic!