The Exorcist is a given. I'd also say the original Texas Chainsaw Massacre. And do remember the beginning of Texas Chainsaw Massacre 2 scaring the shit out of me when I was a kid. Mainly this scene:
Just the way Leatherface taunts them is incredible.
Bill Moseley as "Chop Top" also made that flick awesome:
"Music...is my life...."
