The Godfather
The Godfather Part 2
Dog Day Afternoon
Taxi Driver
The Deer Hunter
Mean Streets
Raging Bull
A Bronx Tale
Goodfellas
A Clockwork Orange
The Conversation
Casino(havent seen it in awhile, so it might movie higher)
Apocalypse Now (again, see above)
Serpico
The Usual Suspects

Thats just what I can think of right now. I know I'm forgetting a ton.

If winners never lose, well, then a loser sure can sing the blues.