Bart gets Mrs. Krabappel fired after she confiscates the class's cell phones, but soon starts to feel guilty when a hip, new teacher is hired in her place and Mrs. Krabappel gets a job at a muffin store thanks to a self-help book.

!! Tropes:

* BigNo: Bart when he learned how many competitors Mrs. Krabappel had during her job running a muffin store.
* GettingCrapPastTheRadar: Principal Skinner says he cannot fire a teacher for as long as said teacher shows up for work and doesn't touch anybody.
* {{Revenge}}: After getting her teaching job back, Mrs. Krabappel forces the kids who got her fired to eat stale muffins.