"How dreadful!" cried Lord Henry. "I can stand brute force, but brute reason is quite unbearable. There is something unfair about its use. It is hitting below the intellect." ~ Oscar Wilde - The picture of Dorian Gray
"TONY STARK WAS ABLE TO BUILD THIS IN A CAVE! WITH A BOX OF SCRAPS!" - Jeff Bridges, Iron Man
It might be just me, but people yelling at each other strikes me as funny. What's even crazier, the darker the person's skin tone, the more hilarious it is to watch them freak the hell out.
Case and point: Glen, the geek dude in Transformers. Glen was the only character in the movie that actually had me laughing my ass off by spending most of his time onscreen freaking out. The scene where he and his cousin panic as feds storm the house is the funniest part of the whole movie, with the crowning cherry being the cousin by tearing across the yard and diving headfirst into the pool.