There's so many that I enjoyed and several of them were already mentioned, so I'll go with some of the less-traveled ones:
Starship Troopers: I really like Paul Verhoeven and this is one of his masterpieces. The storyline itself should be reason enough to enjoy this film.
Contact: Although some will complain that it's a bit slow-moving, I thoroughly enjoyed it and recommend it to anyone, especially to fans of Carl Sagan.
Fire in the Sky: Based on a true story, this was a sleeper of a movie upon release. Many skeptics think it a fairy tale, but so what?
Communion: Who doesn't like Christopher Walken as a dark character? This book scared the Hershey's Kisses out of me.