The humor was...........well look at the guy, it was obvious he never even held a pair of nunchucku, heck he even pronounced it NUMchucks.
For me, the humor was nostalgic. I think everyone had kids like that in High School, heck I think I was one. His lies "there is a buttload of gangs at this school who keep bugging me to join cause I'm pretty good with a bo staff" and such were great. Or the over the top Martial Arts instructor, teaching Rex Kwon Do, or that Kip was claiming to be training to be a cage fighter. And you didn't have that friend who obviously did not have a girlfriend but told everyone he had a girlfriend, but she lives in a different town, or state, that is classic. The humor is not for everyone, I mean Napoleon wore moon boots through the whole movie for crying out loud (remember those?), but what movie is?