Sometimes, the funniest parts of Seinfeld happen when a character goes on and on, ranting about something or another. You really need a VCR to watch these, because you're laughing so hard you miss stuff. My favorite examples OTTOMH (off the top of my head):
1) Mr. Bookman in "The Library" One long rant from when he comes in the apartment. Goes on for like 5 minutes. "...where a little boy can go to read The Cat in the Hat or The Seven Chinese brothers without seeing pictures of wee-wees and pee-pees... or maybe you like that? Well listen up, Joy boy..." (not verbatim due to it being all OTTOMH)
2) George from "The Truth" "It is the earrings... it is the chopsticks... but it's so much more! You're *pretentious*!"
3) Jerry from "The Switch" "I'm not an orgy guy..."
4) Jerry from "The Parking Garage" "The truth is... I have uromycitosis..." "...my brother and his friends are probably peeing all over town"
5) George from "The Opposite" Yelling at the rude people in the seats behind him