Hummmm....I have so many favorites since this is the first fav of types of movies to watch! I would have to say sixth sense, the others, red rose, the ring, the grudge....I just can't decide on just one! :)
Halloween (first movie) was a favorite of mine. Also "Storm of the Century" was one of those you will never forget either. One more that is at all time favorite is "The Shining".
oohhh - shudder at the shining. red rum red rum.... And I cannot tolerate Stephen King's weirdness . I also cannot stand Jack Nicholson -wasn't he in some weird horror movie also? He just creeps me out so bad-- his roles, his demeanor, everything!