Bart suspects a rat in his circle of friends when all of his pranks backfire. Meanwhile, Homer grows attached to his rental car, which he gets to drive for a week while his old car gets repaired.

!! Tropes:

* BaitAndSwitchComment: When Bart reunited Nelson, Milhouse and Donny to talk about the rat, his comments suggested he figured out Donny was the one but he suspected Milhouse.
* TheMole