Brazil (personal favorite with the one below)
The Big Lebowski (don't know why, I just love this movie)
Blade Runner (best sci-fi ever)
Pulp Fiction (best modern american film)
Finding Nemo (best animated movie I've seen)
Monty Python and the Holy Grail (funniest)
No Country for Old Men (creepiest bad guy)
Citizen Kane (brilliant)
Fight Club
Life is Beautiful
Goodfellas
Purple Rose of Cairo (Woody Allen's best IMO)
Unforgiven (not really into westerns, but that's good stuff)
Wings of Desire (a bit hard to get into, but very good)
Singing in the Rain (the only musical I can stand)
This Is Spinal Tap