"Beware My Cheating Bart" is the eighteenth episode of the twenty-third season of the American animated television series The Simpsons.
During a day out in the mall, Homer chooses to drop Milhouse and Bart at a children's movie so he can eat at the food court.
Both of them leave shortly after seeing the only part of the movie that appeals to Shauna (the man's ass) and they hang out in the mall.
Shauna breaks up with both of them after some good advice from Lisa, and Bart receives his punishment (being held upside down from his treehouse to have the "fear of God put into him") from Jimbo.
He is initially furious at Marge and hints at their marriage failing, but a romantic evening planned by her resolves matters.
[1] Executive producer Al Jean stated that it was misinterpretation of something Groening had said for decades in that parts of the show were inspired by his childhood in Oregon.