Episode 11 of "Grounded for Life"
s01e11 Jimmy's Got a Gun

Sean and Claudia are concerned when Walt gets Jimmy a BB gun for his birthday. Sean's also a little disappointed that the steel drum he got for Jimmy gets ignored as soon as Jimmy opens the package with the gun. Walt explains that with supervision and safety equipment, Jimmy will be fine. Sean and Claudia want to take the gun away, but can't because Jimmy is so attached to it. When the boys start shooting everything from groceries to the steel drum Sean got for Jimmy, Sean draws the line. Sean and Walt have a stand-off over keeping the BB gun. Sean tells Walt that he is the boy's father and he will raise his family the way he sees fit. The stand-off leads to Walt telling Sean to shoot him in the butt to prove that it doesn't hurt and that BB guns aren't really dangerous. After a major provoking, Sean pulls the trigger and shoots his father in the rear and actually lands him the hospital.