One Froggy Evening is a 1955 American Technicolor animated musical short film written by Michael Maltese and directed by Chuck Jones, with musical direction by Milt Franklyn. The short, partly inspired by a 1944 Cary Grant film entitled Once Upon a Time involving a dancing caterpillar in a small box, marks the debut of Michigan J. Frog: an anthropomorphic frog with a talent for singing and dancing that he demonstrates for no one except whoever possesses the box wherein he resides. This popular short contained a wide variety of musical entertainment, with songs ranging from "Hello! Ma Baby" and "I'm Just Wild About Harry", two Tin Pan Alley classics, to "Largo al Factotum", Figaro's aria from the opera Il Barbiere di Siviglia. The short was released on December 31, 1955, as part of Warner Bros.' Merrie Melodies series of cartoons.

Plot

A mid-1950s construction worker involved in the demolition of the "J. C. Wilber Building" pries off the top of the cornerstone and finds a metal box within. The unnamed man opens the box and finds, along with a commemorative document dated April 16, 1892, a live frog inside, who dons a top hat and cane. After the frog suddenly performs a musical number on the spot, the man sees an opportunity to cash in on the frog's anthropomorphic talents and sneaks away from the site with the frog in the box under his arm.