“Eat my shorts!” is one of Bart Simpson's trademark catchphrases. Bart uses it to express his rebellious attitude, usually towards authority figures. He pulls his shorts down, and shakes his butt at people, just to offend them. Bart first said it when he was in kindergarten to Principal Skinner, when his misbehaving was revealed in Lisa's Sax. On some occasions, the phrase was taken literally, such as when Bart was teasing a donkey and the donkey really did eat his shorts.