Main story plot: Bart finds out that there is a better prankster than him in Springfield and is determined to find out who it is (as Skinner won't tell him). Side story: Marge needs to start living a healthier lifestyle and serving healthier food in order to stay in her "mommy and me" group.
Story #1: Bart is planning his prank list for the school year and thinks he is top dog of the prankster world. His life is turned upside down when he discovers that he isn't the best at school pranks. Turns out the best prankster was 19-year-old Andy Hamilton (voiced by Jonah Hill). Andy's biggest prank (filling the school's swimming pool with worms and trapping Skinner in the pool for three days) back in his day completely changed Principal Skinner and Groundskeeper Willie's lives.
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