Sorry! is a board game that is based on the cross and circle game Pachisi.[1] Players try to travel around the board with their pieces faster than any other player. Originally manufactured by W.H. Storey & Co in England and now by Hasbro, Sorry! is marketed for two to four players, ages six through adult. The game title comes from the many ways in which a player can negate the progress of another, while issuing an apologetic "Sorry!"

In "Vestigial Peter", after Lois mentions how thankful she is that Stewie is too young and innocent to understand the tragedy of Peter's operation, the scene pans to Stewie and Brian playing a game of Sorry! in the waiting room. As the former wins, he shouts "sorry!", resulting in the narrator advertising the board game as a game that teaches its players to be a dick.