Right now, not in order:

Harold and Maude
Pulp Fiction
Forbidden Planet
Raising Arizona
To Have and Have Not
Godfather 1 and 2
Bringing Up Baby
Blade Runner
You can't take it With You
Fight Club
Outlaw Josey Wales
Touch of Evil
The Player
Monty Python Meaning or Lifew and Holy Grail
The Road Warrior
The Thin Man
Larry the Arab
The Party
5th Element
Casino

There's just SO MUCH stuff I left off. I tried to keep it fairly well rounded (altho I notice a marked lack of foreign titles in my list).

Great stuff on others lists like:

Crumb
Odd Couple
Dr Strangelove
Fargo (watched it last night as a matter of fact)
Roger and Me
Sunset Blvd

I left off Schindlers, LOTR, Casablanca intentionally. Overrated to a one.