According to Jim:
Season:     2     / Episode:     6    
Punch and Ruby

Description

Jim is taking the girls to their first Bears football game, and Cheryl asks him to be a good role model and try his best not to swear in front of them. At the game, Jim picks a fight with a Packers fan who was swearing in front of the girls, and the entire fight is televised, with Jim getting the nickname of "Packer Smacker". He finds glory with such nickname, but Cheryl doesn't like it at all. It only hits Jim the effects his actions might have on his children when Ruby hits Gracie in the nose. Jim has to have a talk with Ruby and hear Cheryl says that the next time he finds himself in a situation like on the football game, that he should just think what she would do and do it. But Jim finds redemption when Gracie refuses to eat sundae fudge because she thinks her butt's too big - something Cheryl was saying around the house not too long ago.