The Simpsons Episode 13.09 Jaws Wired Shut

While running rampant through Springfield, Homer accidentally smashes into a new statue of Dredrick Tatum, the heavyweight champion of the world, and breaks his jaw. Dr. Hibbert wires his jaw shut to allow it to heal, and forces Homer to shut his mouth�for once. Because he can't speak, Homer is forced to listen to his family for the first time. To everyone's surprise, Homer is surprisingly good at listening to their problems/concerns and creates harmony in the family.

When he finally gets the wires off, he remains the good listener. Marge steadily begins going crazy as Homer is now the voice of reason in the family. She begins coming loose at the seams and needs an outlet. She decides to take matters into her own hands and fulfill one of Homer's dreams for herself: driving in a demolition derby. Except when she's in the ring, she begins getting pummeled by the other cars. Homer is forced to lose his gentile side and revert back to old-Homer to save the day and ultimately the marriage itself.