According to Jim

When the new DVD player breaks, Jim must find the receipt in order to exchange it. He can't find it anywhere and blames Cheryl of losing it. She says he was the one who lost it, and in order to "win" the fight, Jim buys another DVD player and tells Cheryl he exchanged the broken one. Later, Dana shows up with the receipt, in which Cheryl wrote her a recipe, and Cheryl - after realizing it was her fault after all - burns it. They get into a fight but soon decide to drop the point scoring and just be happy again.