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Sing Song guard (Yosemite) Sam Shultz mistakes Bugs for a prisoner when he tunnels up inside the jail.

Bugs Bunny escapes hunters by leaping into his rabbit hole and tunneling to safety. Unhappily he tunnels into the Sing Song prison where a sadistic prison guard named Sam Schultz refuses to accept that he's anything but one of the prisoners. Soon Bugs is in stripes, but it's the guard who will find prison life to be hell when Bugs Bunny is around to trick him into a cell, the hangman's noose, an electric chair and even into the warden's office, where Bugs will put a severe strain on the relationship between boss and underling. Finally, Sam decides that enough is enough.—J. Spurlin

Bugs is fleeing from hunters; however, in his efforts to escape, he makes a big mistake: he tunnels his way into a prison, guarded by Sam Schulz (an incarnation of Yosemite Sam). Throughout the rest of the cartoon, Bugs tricks Shulz repeated ly by pulling switches. He tricks Sam into locking himself in a cell, switches uniforms with him, and impersonates the warden. Finally frustrated beyond endurance, Schulz kicks Bugs out, whereupon he is sentences to hard time for aiding in the escape. Before the iris out, Bugs confesses to being the stool pigeon who turned Schulz in.—Anonymous

It's rabbit season, and Bugs is frantically fleeing from hunters who want to make hasenpfeffer out of him. He quickly hides in a hole, and makes it to Sing Song Prison ("No hanging around"). Upon exiting the hole, Bugs is mistaken for a prisoner by guard Sam Schultz (that is, Yosemite Sam). He is brutally beaten and forced to crack rocks with a hammer (under the prisoner number 3½).

Bugs fools Sam into letting him escape by stuffing his leg iron into a cannon and being fired over the prison wall. Sam quickly retrieves Bugs, and throws him in a cell. Bugs convinces Sam that he's been locked outside the cell, and when the two switch places, Bugs locks Sam in the cell. Sam escapes and vows to give Bugs solitary confinement for 99 years. Bugs tells him, "You wouldn't be so tough if you weren't wearing that uniform!" They both take their uniforms off and prepare to fight, but Bugs decides not to, deciding Sam really is tough without the uniform. Sam puts on the prisoner uniform, and Bugs puts on the guard uniform, leading to Sam being beaten by other guards and thrown in a cell.

Sam yells to be let out, demanding a mouthpiece and "habus corpeas". Bugs slips by and gives Sam an escape kit disguised as a loaf of bread. Sam digs his way out of the cell, and emerges in a section of lush greenery. This turns out to be the prison warden's potted plant collection, and the warden berates Sam for his actions.

Sam chases Bugs onto the gallows, where Bugs pushes a button and takes an elevator down the gallows. Sam tries the same, but he is hung from the rope. As he inaudibly swears while trapped in the rope, the warden screams for Sam to come to his office. The warden turns out to be Bugs in disguise, who offers Sam a cigar and tells him to sit down (in an electric chair). When Bugs goes to give Sam a light, he turns on the chair, electrocuting Sam. Bugs then blows his disguise when his fake mustache slips onto his cigar, and Sam chases him again. This chase culminates in Sam hitting the real warden over the head with a club. The warden yells at Sam again.

Sam encounters Bugs, and orders him to get out of the prison. Bugs, after some hesitation, obliges and leaves. Sam is overjoyed to be rid of Bugs, but just then, the warden screams for Sam to come to his office again. A dejected Sam slinks away to the office, and soon becomes a prisoner, forced to break rocks. He thinks aloud, "I'd like to know what dirty stool pigeon squealed on me." At that moment, Bugs is seen on the prison wall, standing on a stool and cooing like a pigeon. Iris out.