See the ridiculous lengths Michael goes to for 'revenge' in this highlight from the Utica mission:
The plot kicks off when Michael learns that Karen, now the Regional Manager of the Utica branch, is trying to "poach" Stanley Hudson. Outraged by the betrayal, Michael concocts a heist-style plan to retaliate. : Steal Utica's industrial-grade copier. [S4E6] Branch Wars
This episode is a fan favorite for its physical comedy and the deep cringe of the Jim-Karen reunion. See the ridiculous lengths Michael goes to for