When Wendy tries to prove a point about how much pressure little girls feel to look like celebrities, it gets her in trouble with everyone at school, and gets Clyde a new girlfriend.
Camptown Races — The John Halloran Singers
Butters sings this to himself at school while getting something from his locker. After he turns down Lisa Berger for a date, Wendy Testaburger accuses him of being insensitive to her by calling her too fat for him to date.