Wow. Sorry guys but some of you have tastes for the McDonalds cheeseburgers of movies.

I've always had a thing for science fiction so there are a few in that genre that I enjoy:
2001: A Space Odyssey (a classic)
Forbidden Planet (a cheesy 50's classic. I think I had the hots for the girl when I was about 13)
Gattaga (love that they fly off to Jupiter dressed in suits and ties)
But probably the top ones would be:
City Of Lost Children (fantastically weird French film)
Das Boot
The Blues Brothers