Monkey Business is a 1952 American screwball comedy film directed by Howard Hawks and starring Cary Grant, Ginger Rogers, Charles Coburn, and Marilyn Monroe.

When Barnaby's wife, Edwina, learns that the elixir "works", she drinks some along with water from the cooler and turns into a prank-pulling schoolgirl.

Together, the two attempt to find an antidote and when the baby grows sleepy, Edwina tries to put him to sleep in the hopes of reversing the effects.

Later at home, as Barnaby—who has been offered a new contract with Oxly—and Edwina prepare to go out to dinner, their spirits and marriage renewed, Barnaby notes that "you're old only when you forget you're young."

[4] Jay Carmody of the Washington Evening Star gave the film a lukewarm review, stating, "Dreary business is what it really is.

Farce writing can be a treacherous trade...and not even the insurance represented by Miss Rogers, Grant, and Marilyn Monroe can provide adequate protection in cases like Monkey Business...Miss Rogers and Grant, a pair of gifted farceurs, earn a kind of grudging admiration for giving such a courageous try at such unrewarding material as 'Monkey Business' provides them...In the presence of such silky performers as the picture's veterans, [Monroe's] acting has apparently climbed no higher than one degree above zero but no one will care.