The Ring....hell, I didn't even finish watching it!
The Shining....too many things to mention with that one.
Ohhh...and drat - this is driving me nuts because I can't remember the name. It was about vampires and in this one scene a guy (turned vamp) went to his friends place and was trying to get in....he was scratching on the window. To this day if I hear a tree branch making noise against a window I turn to jelly.
The Omen......yikes!
*EDIT... Salem's Lot was the name of the movie I was trying to remember. *shivers*