My Favorite Science Fiction Films

I have my own definition of the difference between horror and science fiction. If something is chasing people around trying to kill, maim, and/or eat them for no discernible reason other than to scare you, it's a horror movie. It makes no difference whatsoever where or when the film takes place--it's horror. If however,  during the course of the film you look around the theater and half the audience is asleep and the other half is going, "Huh?" Then it's science fiction. What that means is that science fiction is generally more concerned  with ideas that with the visceral. Right now half of you are saying, "But what about STAR WARS, STAR TREK, and STARSHIP TROOPERS?!" Okay, there's always cross-pollenization going on, but those examples belong primarily to the subgenre known as the Space Opera. Anyhow here we go, once again in NO PARTICULAR ORDER.