Lisa tries to convince Homer and Marge that college suits her, but they tell her that college is no place for her at her age. Lisa is also ridiculed by Groundskeeper Willie and all of her friends at school, saying that she is too "college for them". In the meantime, Bart gets used to his bubble, as it brings him a lot of popularity after he is able to bounce off the attacks from the bullies. Bart tells Lisa what she should do to get her friends back: she has to pull a prank on Principal Skinner. The next day, Chalmers is dedicating the Seymour Skinner parking annex. While Martin takes pictures of Skinner posing next to a giant chocolate cake in his white polyester suit, Bart rolls Lisa, who is inside his bubble, to the edge of the school's roof. He then pushes her over the edge, splattering the cake all over Skinner. Lisa gets her friends back, while Bart goes paranoid after being outside of his bubble for the first time in days. He stays in an air vent, but gets sucked in after fiddling with the air conditioning controls.