When you talk about The Haunting being scary, you have to note that it's the 1963, black and white version, not the badly done remake with Catherine Zeta Jones and Liam Neeson. The 1963 version is one of the creepiest things I've ever seen.

And that's another thing. Scary doesn't necessarily mean big BOO!! moments, although too many people seem to think that's what it is.

Scary is something that stays with you, like the final scene in The Blair Witch Project where that guy is standing in the corner. The movie as a whole was lousy, but that moment sticks with you after you leave the theater.

The Changeling, for instance, is very scary, but in a creepy way.