Research chemist Barnaby Fulton works on a fountain of youth pill for a chemical company. One of the labs chimps gets loose in the laboratory and mixes chemicals, but then pours the mix into the water cooler. When trying one of his own samples, washed down with water from the cooler, Fulton begins to act just like a twenty-year-old and believes his potion is working. Soon his wife and boss are also behaving like children.
Unfortunately the movie Monkey Business is not yet available on Disney Plus.
| Directing | Howard Hawks | Director |
| Production | Sol C. Siegel | Producer |
| Editing | William B. Murphy | Editor |
| Writing | Charles Lederer | Screenplay |
| Writing | Ben Hecht | Screenplay |
| Camera | Milton Krasner | Director of Photography |
| Art | Walter M. Scott | Set Decoration |
| Art | George Patrick | Art Direction |
| Writing | I. A. L. Diamond | Screenplay |
| Art | Lyle R. Wheeler | Art Direction |
| Art | Thomas Little | Set Decoration |
| Writing | Harry Segall | Story |
| Sound | W.D. Flick | Sound |
| Sound | Lionel Newman | Music Director |
| Sound | Roger Heman Sr. | Sound |
| Sound | Earle Hagen | Orchestrator |
| Costume & Make-Up | Ben Nye | Makeup Artist |
| Costume & Make-Up | Travilla | Costume Designer |
| Sound | Leigh Harline | Original Music Composer |
| Costume & Make-Up | Charles LeMaire | Wardrobe Supervisor |
| Visual Effects | Ray Kellogg | Visual Effects |