Walter's family is holding a yard sale, but there are few customers. Walter, farting contentedly near Father, wonders why. When a man offers ten dollars for Walter, Father readily agrees. Walter wonders why. Walter is sad to leave his family behind but relieved to discover that his new owner is a clown. Walter figures he will help the clown bring joy to children on their birthdays.
But the clown has a dastardly plot: He will use Walter's gas to inflate balloons and then pop them to stun guards during bank robberies. Will Walter turn to the dark side? Of course not! He comes out a hero and is reunited with his family by doing what he does best.