How about George having sex, listening to his radio and eating a pastrami sandwich at the same time.
Elaine has a date with the guy who wants complete silence whenever "Desperado" comes on.
Kramer wants Jerry to pick up "the Cubans" when he's in Florida. Instead of being cigars they end up being actual Cuban guys.
George: "Remember, it's not a lie if you believe it."
George pretending to be an architect to get a date.
The other time he tells a girl that he's a marine biologist, then there's the beached whale on the shore.