Not sure if I could single out 1 film, but here goes with a brief list of films I love (in no particular order):
Gattaca
Star Wars
Metropolis
12 Monkeys (and its inspiration, La Jetée)
Purple Rose of Cairo
Oktober
Battleship Potemkin
Nosferatu
Land and Freedom
Rock the Cradle
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Time is an illusion. Lunchtime doubly so.
Epona of The Laughing Hyenas
Proud winner of the 'Most Useless Post 250 Has Ever Seen' Award 2001. "I'd just like to thank my friends and family, without whom none of this would have been possible..."