My favourite episode is "The Dealership" when Puddy becomes a car salesman and wants to give everyone high-fives.
JERRY: So, Puddy, this is a pretty good move for you, huh? No more "grease monkey".
PUDDY: I don’t care for that term.
JERRY: Oh. Sorry, I didn’t know..
PUDDY: No, I don’t know too many monkeys who could take apart a fuel injector.
JERRY: I saw one once that could do sign language.
PUDDY: Yeah, I saw that one. Uh.. Koko.
JERRY: Yeah, Koko.
PUDDY: Right, Koko. That chimp’s all right. (Holds up his hand) High-five.
ELAINE: You’re a salesman now - and the high-five is… it’s very “grease monkey.”
PUDDY: What did I tell you about that?
ELAINE: Ah, I, I’m sorry, but the high-five is just so stupid.
PUDDY: Oh yeah? I’ll tell you what’s stupid. You. Stupid.
ELAINE: Oh, that is really mature.
PUDDY: Yeah? So are you. You’re the grease monkey.
ELAINE: Uh… that doesn’t make any sense. I am leaving.
PUDDY: Yeah, if you leave, we’re through.
ELAINE: Fine! We’re through!
PUDDY: Oh, so you’re leaving?
ELAINE: That’s right. High-five! On the flip side!