[JWsleep]

Impossible to really pin it down, but:

Casablanca
His Gal Friday
Maltese Falcon
Godfathers 1 and 2
Starwars
Apocalypse Now
All the Coen Bros. flicks (the Big Lebowski rules)
Jaws
Raiders of the lost Ark
Marx bros
Drunken Master 2
Sleeper
Its a wonderful life
Reservoir Dogs
A Clockwork Orange
Brazil
THIS IS SPINAL TAP!!!!

I've really been grooving on the following 4 flicks:
Being John Malcovich
Adaptation
Confessions of a Dangerous Mind
The Eternal Sunshine of the Spotless Mind

All written by Charlie Kaufman. Very trippy indeed.

There are a million more...