I think the funniest part is when Napoleon is just standing there minding his own business and some kid comes over and beats the crap out of him for seemingly no reason. I'm sorry but I think that's funny.
Glad you enjoyed the movie. I thought it was fun but I wouldn't rate it as one of the funniest. What's nice about it is nearly everyone can identify some stereotypical high school kid there. I know Preston, where it was filmed, a bit. My mom grew up near there across the valley in Weston and nearby areas. I went to a high school with a lot of kids like that. I don't really remember the beating up part.