Personally, I own 12.
I have the entire Kevin Smith collection :Clerks, Mallrats, Chasing Amy, Dogma, and Clerks: Uncensored (animated series)
Snatch
Office Space
The Jerk
Eraser
Bill & Ted's Excellent Adventure (Christmas present from my little brother
)
Big Daddy
and finally, I'm ashamed to say I own a copy of The Fast and the Furious :o
I'll be adding Fight Club as soon as Best Buy gets some back in stock
and the final Kevin Smith flick will be mine the day it is released (Feb. 2nd I believe)