After Shelbyville accuses Springfield of being hicks, Marge convinces the townspeople to fund a Frank Gehry-designed concert hall, which is then converted to a prison when the concert hall goes bankrupt on opening night. Meanwhile, Bart and Lisa investigate Snowball II's recent weight gain.

!! Tropes:

* {{Foreshadowing}}: When Fat Tony recognizes Marge as the woman who occasionally drives her son to school, she figures out he must be Michael's Dad. Michael will play a large role in [[Recap/TheSimpsonsS18E1TheMookTheChefTheWifeAndHerHomer a later episode]].