Simpsons Season 5, Episode 17: Bart Gets an Elephant

While stuck cleaning the house, Bart wins a radio contest and chooses a gag prize, an Elephant, instead of the real prize, $10,000 cash. The radio station eventually gets Bart his elephant, which is named Stampy. When taking care of Stampy gets too expensive Homer decides to sell him to an ivory dealer rather than turn him over to a non-profit Animal Refuge.