Planes, Trains, and Automobiles - Haven't seen it.
UHF - Haven't seen it.
The Jerk - Haven't seen it.
South Park: Bigger, Longer, and Uncut - This one got my vote. I'm not the biggest fan of the show (I like a lot of episodes, but I tend not to like the moments when the show gets all smug & preachy) but this is seriously one of the funniest movies I've ever seen.
Scary Movie (1,2,3,4) - These diminish in quality; I liked the first one, the second one was alright (although I seem to be one of the few who think that), the third was so-so, and the fourth sucked.
Anything with Steve Martin - Including Cheaper by the Dozen? Hell no.
Anything with Eddie Murphy - Including Norbit? Hell no.
All parody movies. - Including Epic Movie? HELL no. (Seriously, I'm not exaggerating when I say that Epic Movie is the single worst movie I've ever seen in my life.)
So, South Park: Bigger Longer & Uncut it is.