Lisa and Homer make a bet on who won the 1948 presidential election. Lisa wins and she gets to choose the activity for Daddy-Daughter Day. Her activity is taking part in building homes for a Habitat for Humanity alongside Jimmy Carter, Bill Clinton, and George H. W. Bush, whose relationship mirrors that of the Three Stooges. While painting, Homer takes off his wedding ring (which actually is a Band-Aid with tin foil wrapped around it, as Homer's real wedding band was swallowed by a turtle) in order not to get paint on it, and Lindsay Naegle and Cookie Kwan mistakenly think Homer is a bachelor. Marge, driving by with Maggie, sees Homer appearing to flirt with the women by flexing his muscles (though he is actually acting out Marge going into labor when she was pregnant with Bart). She worries that Homer has lost interest in her, so she decides to get liposuction, on the advice of Manjula. Unfortunately, a mix-up causes her to get breast implants, which were intended for one of Mayor Quimby's female interns. The doctor says that Marge must wait for 48 hours before the implants can be removed.
Meanwhile, Bart and Milhouse watch an old episode of Batman, featuring Krusty as a villain named Clownface, who threatens Batman with a rapidly spinning carousel of death. Bart and Milhouse like the idea, inspiring them to recreate the stunt, with Bart putting Milhouse on a merry-go-round in school. Otto uses the bus to kick-start the merry-go-round, spinning it at an incredible speed. The bolts give way and the merry-go-round goes flying through the air, knocking over the school flag. Milhouse vomits on the flag while Iwo Jima veterans are visiting the school. As Principal Skinner catches Bart for it, Bart confessed that he and Milhouse saw Krusty do the stunt on television. In response, Skinner leads a group protesting against Krusty, who is now seen as a dangerous influence to children. Krusty's show is revamped to exclude anything considered dangerous and likely to be imitated by impressionable viewers (to the point that Krusty's monkey sidekick, Mr. Teeny, has to be sent back to the wild).
After coming home from her surgery, Marge realizes that her very large breasts are making her life difficult in doing even the simplest tasks. Marge tries to hide her breasts from her family, but Homer and the children find out Marge's secret after a few short hours. Homer, Marge and the children go out for dinner to the local Italian restaurant. Luigi, who had just rejected Ned Flanders and his family, immediately admits the Simpson family. Kiki Highsmith, a trade show executive, approaches Marge and offers her a modeling job. Marge accepts and initially enjoys the experience, but is soon plagued by backaches and every man in Springfield sexually harassing her.
At the Springfield Shoe Expo, Marge is further humiliated and objectified by lustful men while promoting shoe horns. At the same time, Bart helps Krusty to win back his popularity, using Milhouse and Stampy, Bart's old pet elephant, in a stunt. The stunt quickly goes out of control when Stampy stuffs Milhouse and Bart in his mouth. Homer tries to save them, but get stuffed into Stampy's mouth too. Krusty forgets the word that was supposed to make Stampy submit and lie down. The police decide to shoot at Stampy, which would endanger Homer, Bart and Milhouse. Marge appears on the scene, and after unsuccessfully trying to dissuade the police shooting (as Chief Wiggum claims that they do not negogiate with elephants), distracts the police by flashing her huge breasts to the assembled crowd. Krusty, still hated by residents of Springfield, saves the day by accidentally saying Stampy's safety word "Magumbo" while ogling Marge. Stampy releases Bart, Milhouse, and Homer, and Krusty is hailed as a hero and his popularity is restored with the town (though the story of how Krusty saved the kids is relegated to only a paragraph in the local paper while the story of Marge flashing the crowd at the shoe expo received 25 pages with photos). In the end, Marge has the implants removed, and Homer suggests that the family goes out for fried chicken.