Monkey Business (1952)

Plot:

Barnaby Fulton is a research chemist working on a fountain of youth pill for a chemical company. While trying a sample dose on himself, he accidentally gets a dose of a mixture added to the water cooler and believes his potion is what is working. The mixture temporarily causes him to feel and act like a teenager, including correcting his vision. When his wife gets a dose that is even larger, she regresses even further into her childhood. When an old boyfriend meets her in this state, he believes that her never wanting to see him again means a divorce and a chance for him. Barnaby Fulton, a chemist, is working on a youth formula for a chemical company by testing it on chimps. His very understanding wife, Edwina, helps him by being very supportive. His boss' secretary helps by displaying her legs, which are wearing Barnaby's indestructible hose. When Esther, the chimp, mixes her own formula, and it gets in the water cooler in the lab, the fun begins! Barnaby goes back in age twice, as does Edwina. Wild rides in a hot sports car, roller skating, jive dancing, and scalping Edwina's childhood boyfriend, Hank Entwhistle, all ensue. Barnaby and Edwina live happily ever after, supervising Esther's formula-making.