Toby is captain of an old time Mississippi paddle-wheeled steamboat. When he arrives at the dock, a brass band greets him and tickets are sold for the show held inside. Smiling broadly and shaking hands with every customer as they board becomes a strain for Toby so he rigs up a monkey's tail to hold his mouth up in a grin position. The show has Patsy singing a rousing rendition of "Mississippi Mud"- so rousing the audience causes the ship to break it's moorings and race down the river with her still inside and Toby to fall overboard. He catches up to the runaway ship, and rearranges the paddles to become propellers, and the ship flies out of danger.