A Funny Thing Happened on the Way to the Forum is a 1962 Stephen Sondheim Broadway musical based on a Roman farce by Plautus (254–184 BC), that became a 1966 musical movie by Richard Lester.
The story is about a Roman slave named Pseudolus, who tried to win his freedom by persuading his owner Hero to win the heart of Philia (the girl next door), who is promised to Roman soldier Miles Gloriosus.
The show became a great success when Stephen Sondheim changed the opening song, Love is in the Air to Comedy Tonight, showing how romance is better sold as comedy.
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