Glad to see other fans of The Haunting here. I love that movie. I've seen it at least 6 times, and it never fails to scare the daylights out of me. I love that scene where Julie Harris and Claire Bloom are cowering in bed while something comes stomping down the hall towards their room. We are never allowed to see the ghost, if there is one, and for me that heightens the tension.
The second-scariest movie I've ever seen was Poltergeist. The scene where the guy rips his own face off in the bathroom still gives me the creeps. To this day I can't watch that scene. And then there's that evil clown doll, LOL.
The Haunting is my all time fav too.