The Simpsons are holding a dinner party, and one of their guests are the Hibbert family. Homer decides to play a prank on Dr. Hibbert by placing an ice cube fly in his drink, which Homer finds hysterical. Dr. Hibbert doesn't find it funny at all, actually being embarrassed like that drives him crazy. One day Homer is sent to the hospital and coincidentally he attending physician is Dr. Hibbert. Dr. Hibbert remembers the prank, and decides to get even. He deviously murders Homer, and laughs about it alone. He finally got his revenge.