Season 4, Episode 20: "The Junior Mint"

Have you ever forgotten the name of someone you have been around for so long it has now become embarrassing to have to ask? Then you can understand Jerry’s frustration in this episode. With his only clue being that her name rhymes with part of the female anatomy, Jerry’s only guess was "Mulva", which of course causes her to storm out. Later, Kramer and Jerry observe the splenectomy of Elaine’s artist ex-boyfriend, whom she recently got back together with due to his weight loss, and they somehow drop a Junior Mint into his body cavity. They think they killed someone, buy thousands of dollars worth of his art, only to have him miraculously recover.