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Joanie and Richie come through the back door carrying some boxes. The boxes are stuff for the school's time capsule project. Richie and Marion argue with each other about Richie leaving the place a mess. Howard returns home from work and asks for some peace and quiet. Joanie leaves. Fonzie comes through the back door in an uproar and says a T-shirt of his (number 23) is missing. Richie says he took the shirt. Richie wants to use the vault at Howard's hardware store, and he finally relents and lets him use it. Howard and Marion go out to eat. Richie says Fonzie should be represented in the time capsule, and that's why Richie took his T-shirt. Al and Miss Radcliff talk at Arnold's. Fonzie brings the original Fonzie leather jacket for the time capsule. Fonzie greets Miss Radcliff, who is from the board of education and is in charge of special projects, but he gets the cold shoulder from her. Potsie and Ralph want to go out with Rebecca and Candy who are also working on the time capsule. Richie takes Kim to the vault, and Potsie, Ralph, and the girls go as well. Fonzie and Miss Radcliff are spotted in the vault behind a box. Potsie accidentally locks them in after Miss Radcliff leaves the time capsule. Ralph panics. The vault only opens from the outside. Fonzie tries to ration the food, but there is no food to ration. Potsie sings "Get Happy" and then "Lollipop" while Kim plays the ukulele. Richie and Fonzie sit on a hammock and wonder how air will get into the vault. They talk about being scared. Ralph has a chocolate bar that he secretly eats before changing his mind and offering some to everyone else. Two robbers (one of which is named Nick) come into the vault and are chased out by Fonzie. Potsie almost closes the door again, but Fonzie stops him. Fonzie managed to get the license plate number and asks Richie to give it to his father. Richie learns that people act differently when they're scared and under pressure. At the house, Richie makes a tape recording for the vault. Everyone records a message, and Fonzie's message is, "Aaayyy!"

Songs in this episode:
"Get Happy" (briefly sung by Potsie) by Ruth Etting (1929)
"Lollipop, Lollipop" (sung by everyone in the vault) by The Chordettes (1958)