My favourite episode is the shrinkage ep.
George has never seen his girlfriend naked but Seinfield and friends see her topless sunbathing.
After a cold swim George and Seinfeld confront Elaine.
George and Seinfeld try to explain to Elaine that mens organs shrink in the cold. She looks surprised and says, "it shrinks!, I'm surprised you guys can walk around with that dangling between your legs" and walks out.
George's girlfriend accidentally walks into a naked George after a swim in the pool as she laughs her head off!!!...