I just remembered a good one: Andy Warhol's Dracula
Had the best 3D effects of any movie I had seen at the time (used the two projected images with oppositly polarized light method). Main drawbacks were its self-cousciously deliberate attempt to be a bad movie, and its raunchiness ("To truly know life, Igor, you must first f##k death in the gall bladder" [quote is from memory and only approximately correct]).