Forgot a couple of those! Dr. Strangelove and most of the Christopher Guest movies (starting with the Tap!) would get my vote too. Godfather I and II were great, but III, well, I shut it off about a half hour in and haven't forced myself to endure the whole thing yet.
Office Space, forgot about that one. Yes, I am one of those sumb****es prone to quote that movie randomly. I formally apologize to society at large for the failing. Oh and Zoolander, one of the few movies of that set (Owen Wilson, Will Ferrell, Ben Stiller) I still quite like.