2001: A Space Odyssey
See it once, just to say you did.
Though a beautiful film, it just doesn't quite work for me. Visually it's stunning unlike anything before, but it's quite a bore. The story, just doesn't quite make sense to me, I must admit, I'm not into sci-fi like a lot of others, but, see this once, and then go see his far superior film Dr. Strangelove.