A lot of them have already been mentioned in here:
Shawshank
Tombstone
Bond movies
Patton
The Godfather 1 & 2
Goodfellas
The Bourne movies
Eastwood westerns
Saving Private Ryan
The Dirty Dozen
Kelly's Heroes
Repo Man
Gladiator
Blue Velvet & Mulholland Drive
High Plains Drifter
The Good, The Bad, and The Ugly
Taxi Driver (though that's once-twice in a year thing)
Blade Runner
Fear and Loathing in Las Vegas
12 Monkeys
A Clockwork Orange
Fight Club
Blade Runner
Blazing Saddles
Mystery Science Theater 3000 (The Movie...keeping it in topic)
Monty Python and The Holy Grail