"The Haunting" (1963 version) is one of the scariest movies you'll ever see that has no gore, no violence...and is in black and white. Still gives me the creeps and I've seen it many times (and will be watching it again this weekend).

"The Haunting" (1999 version) is one of the dumbest and most unintentionally funny movies you'll ever see. None of the charm and suspense of the original, imo.

"Psycho" is also a good, no-blood, REALLY scary movie (I'm talking the 1960 original...NOT the 1998 remake).