I can't exactly one favorite so I'll just name all of them:
The Big Lebowski, The Boondock Saints, Dodgeball, Eurotrip, Fight Club, Donnie Darko, Saw, Harold and Kumar, Pi, Requiem for a Dream, http://www.imdb.com/title/tt0214388/ [inactive] (it's not a porno, see for yourself), Bad Santa, The Bill & Teds, Billy Madison/Happy Gilmore (they're the same movie), Dirty Work, Dogma, Dude Where's my Car?, Iron Monkey, Dumb and Dumber, Iron Monkey, Equilibrium (I lied, this is probably the single greatest movie in existence), High Fidelity/Grosse Pointe Blank (John Cusack flicks, similar humor), Idle Hands, Jay and Silent Bob Strike back, Ravenous, Snatch, Lock Stock and Two Smoking Barrels, Baseketball <-the best Matt and Trey movie, The Machinist, Batman Begins, Memento <- see this!
I have Orgazmo but, it didn't really do it for me. It was hard to find because they "destroyed" all existing copies but, since have recently released the unrated version. I remember loving Musa (especially when he throws the thing into the guys thing? you remember) but I only saw it once and awhile back. I've seen Napoleon Dynamite a few times and I gotta say it is good for backround noise. I hated the feel of the movie but it has some good quotes. Anyways, I see way to many movies and I have to many to recall right now. Sorry for f*cking up the page.