Stan and Cartman are playing in a boat that Cartman claims is his uncle's when Cartman dares Stan to drive the boat, claiming he will take the blame if trouble arises. However, as Stan does not know how to drive a boat, they crash into the world's largest beaver dam, flooding the town of Beaverton. Cartman reveals that he lied about the boat belonging to his uncle and convinces Stan to try to hide their involvement by maintaining complete silence about the incident.