In now particular order, and just off the top of my head:
All Quiet on the Western Front (1930)
War of the Worlds (1953)
Blade Runner
Brazil
Planet of the Apes (1968)
The Day the Earth Stood Still (1951)
Casablanca
Alien (am I the only one who liked Alien better than Aliens?)
Primer
Raiders of the Lost Ark
A Clockwork Orange
Full Metal Jacket