Household code (sometimes unspoken) that defines how siblings or friends take turns playing a video game that is single player or when there is not 2+ controllers.
If you die or beat a level, pass the controller.
Little Sally and Billy are taking turns playing Super Mario Bros. Sally is first, and Billy is waiting his turn. Sally walks into the first Goomba in World 1-1. Noob
Billy: "My turn!!" *snatches controller*
Sally: "But I just started! No fair!"
Billy is correctly exemplifying the One Life/Level Rule. Sally needs to learn how not to be a scrub