According to Jim: Season 7, Episode 4

7 - 4: The Perfect Fight

Cheryl and Jim have an evening at home without the kids and decide to stay in and just have dessert for dinner. But Jim's choice of pastries causes a spat which morphs into an all-out food fight. The next day they laugh off the night's argument; Jim is thrilled that they don't seem to have to talk things out. But then Andy, who's out for revenge on Jim for coaxing his kids to play pranks on him, counsels Cheryl to really dissect and analyze her marital arguments.