After
Bart is apprehended for playing pranks on the teachers of
Springfield Elementary,
Principal Skinner reveals to Bart that he is not the greatest prankster to ever walk the halls of the school. Bart is shocked by this revelation and sets out to discover the identity of this prankster. After sifting through countless back issues of the school paper, he discovers that there is a two-week gap in its publication dating back ten years, and that there is a substantial change in Skinner's demeanor and appearance before and after the gap.
Groundskeeper Willie eventually tells Bart that he was once the school swim instructor, and that Skinner was once fun-loving and laid-back until an incident dubbed "Night of the Wigglers". Here, a prankster named Andy Hamilton locked Skinner in a pool full of
earthworms for three days, changing Skinner's personality for the worse. Bart meets Andy and discovers that he is unemployed and lives with his mother. When
Lisa suggests Andy is a loser, Bart gets him a job as
Krusty the Clown's assistant as a favor Krusty owes him, but is angry when Andy quits after one day. Bart gets him rehired and goes to check Andy's progress. When a truck full of
earthworms labelled "Prank Grade" drives into the studio, Bart is terrified that Andy is repeating the "Night of the Wigglers" prank and that Krusty will end up a loser like Skinner. He discovers however that it is part of the show, and that Andy has been hired as a head writer for Krusty's show and has a girlfriend, much to Bart's delight. Despite Andy's success, Lisa still thinks that he is a loser, believing that writing for a comedy show is no better than the life of a prankster. Meanwhile,
Marge is harshly criticized by other
Springfield mothers for serving unhealthy snacks at their "Midday Mommies" meeting. In response, she burns the family's junk food and the family purchases
organic food, which is very expensive and has a short shelf life. At the next meeting, while the other mothers enjoy Marge's healthy food, they become horrified at Marge for using non-stick bakeware (which contains
PFOAs) and having the babies drink out of plastic drinking bottles marked with number 7 (which has the potential to leak
BPA). The other mothers storm away and get into a nearby ambulance, tossing out
Hans Moleman in the process. Marge realizes that she misses eating junk food and
Homer later catches Marge eating from his stash of candy, and the two of them have sex while indulging in junk food together, and then agree to only make the kids eat healthy. ==Production==