I notced there are a lot of these jokes:
Elaine: "Cash? That's something my uncle would give me!"
then Kramer walks in a little later.
Kramer: "What did you get Elaine?"
Kramer: "Cash? Well that's something her uncle would give her!"
These jokes are so constant in Seinfeld it's a bit annoying. Still, it's my favorite non-animated sitcom along side Friends.