Otto breaks up with his fiancee Becky at the altar, leaving her to stay at the Simpson's house, where Marge fears Becky will replace her as a better wife and mother. Meanwhile, Principal Skinner assigns Bart's class into making a video (so long as it's not a parody or rip-off of ''The Blair Witch Project''), which the school was able to afford by cutting geography lessons from their budget.

!! Tropes:
* JerkassRealization: While explaining what Becky would do to her, Marge reminds Selma and Patty whos their brother-in-law [[note]]Homer[[/note]], making the sisters react with Patty responding, ''Its an act of violence, not love''.
* IsntItIronic: Otto proposes to Becky by playing the Music/{{Poison}} song "Every Rose Has its Thorn", which is actually a breakup song.
* OutOfCharacterMoment: Some fans hated this episode because Marge was jealous of Becky for no reason (other than her sisters scaring her into thinking that having Becky in the house will turn her life into ''Film/TheHandThatRocksTheCradle'') and tried to attack her.
* PoliceAreUseless: Well, they're powerless to ''protect'' Marge but not to ''punish'' her.
* RightForTheWrongReasons: Selma and Patty brought up the idea that Becky was going to kill Marge, when turns out to be true had Becky not abandon the plan.
* RuleOfThree: Bart heard a rumor that Marge shows up to those who scream "Mad Marge" three times.
* ShoutOut: The title is a play-on to the 60s film "ItsAMadMadMadMadWorld".
** The Dancing Marges is a parody of the "Dancing [Judge] Itos" during the OJ Simpson trial.
* TooSoon: Bart's InUniverse reaction to the "Dancing Marges" sketch.