Back to the Future. But I need all three. Is that cheating? Back to the Future is a classic. It never gets boring in my opinion! All other movies have run their course but I have been watching Back to the Future for years. I knew I should marry Ryan when he already owned the trilogy on DVD when we met. Is that a reason to marry a guy or what?
Runners up include Harry Potter, probably The Prisoner of Azkaban if I had to choose just one. Or a good Disney movie, like The Fox and the Hound.