The storyline involving Gunther the monkey and how he is so smart is quite funny, but the best moments for me involve Bender and the nerd robots of robot house pulling pranks on everyone.
The robots want to be cool like Bender and so he teaches them. The dean is obviously a jerk who has it in for the robots.
This is one of the funniest because it reminds me so much of what it was like it school. There were different groups - rich, popular, nerds, etc (not robots though)