Marge protests against mixed-martial arts after Bart gets in trouble for fighting in school.

!! Tropes:

* AbuseIsOkayWhenItsFemaleOnMale: Lisa beating up Bart at the end of the episode.
* ISurrenderSuckers: Chett used this strategy to trick Marge. [[spoiler:It didn't work]].
* WouldHitAGirl: Chett had no trouble with the notion of hitting Marge. At least until he hit bart and she went MamaBear on him.