Oh yeah! Goodfellas.
A great movie. Not to be compared with The Godfather, of course, but still fantastic.
EDIT: Don't think many movies have that in the beginning, so I suppose I can continue the game as Lonely Vazdru doesn't seem to be here.
So here goes, my quote:
"I watched a snail... crawl along the edge... of a straight razor... That's my dream... That's my nightmare... Crawling, slithering... along the edge of a straight... razor...
And surviving."