Bart meets the boy responsible for the greatest prank in Springfield Elementary School history, and discovers that he's now a 19-year-old loser. Meanwhile, Marge is scolded for providing unhealthy snacks for Maggie's play group.
Fed up with Bart's constant pranks, Principal Skinner tells Bart that there is a former Springfield Elementary student hailed as the best prankster ever - even better than Bart - but he won't divulge the legendary student's name. Bart finally gets Groundskeeper Willie to reveal the prankster's identity: Andy Hamilton. Bart tracks down Andy, who is now 19 years old and hasn't grown out of his pranking days. Bart and Andy become fast friends until Bart gets Andy a job working for the ultimate clown.—Fox Publicity