I was very excited to see the American Reunion movie. I saw American Pie just after college and remembered it was quite funny.
Jim, Michelle, Oz, Heather, Stifler reunite for their high school...
I don't think Accion Mutante (1992) has been mentioned yet. It's a Spanish film set in a Gilliamesque dystopia in which hideous mutants are a despised underclass. So they form a revolutionary group and fight back. Best running gag is a guy who remains attached to his dead (stuffed) siamese twin.