Bert complains about Ernie having the radio volume on too loud. Ernie pulls the knob off the radio and puts it on Bert's stomach, and turns the volume of Bert's voice up and down.
Ernie's Barber Shop: Part 1: Ernie is a barber, and cuts all of Bert's hair off. Part 2: Ernie tries to disguise Bert until his hair grows back, but a monster (later known as Grover) mistakes Bert for his father. Part 3: Bert has grown his hair back, but now he talks like Cookie Monster.
Ernie comes from finishing his bath, and tells Bert that there's something that he forgot. Bert asks if he's washed behind his ears, his neck, and his elbows. Finally, Ernie remembers that he forgot to turn off the water in the tub -- as the water level rises.
Bert tells Ernie not to eat cookies in bed, because he might get crumbs in the bed. Ernie decides to eat cookies in Bert's bed instead.
Ernie and Bert plan to go to the zoo, but they can't make up their minds. What would happen if Ernie bought a balloon, but then lost it when he gets frightened by a buffalo? Then they remember that the zoo is closed on Wednesdays.
Ernie realizes that Bert's not home, and that he can do whatever he wants. He acts out a typical scenario in which he plays the radio loud and Bert tells him to turn it down ... but it doesn't feel the same without Bert around.
Ernie won't stop saying how thirsty he is, no matter how many glasses of water Bert brings him. Even after he's finished, he still won't stop saying "Boy, was I thirsty."
Bert tells Ernie not to open the locked door until he gets back from his shopping trip. After he leaves the apartment, however, he realizes he forgot his money, but no matter what he does, Ernie won't let him in the apartment because he thinks this is practice.
Ernie plays a game with Bert where Ernie plays riffs on his drum set and Bert has to repeat them back. Bert is surprisingly good at the game.