Wounded during a rugby match he'd come to Paris to play, Tonin Bonnafous, a thoroughbred southerner, settled in Paris with a former stalag mate he'd happily met. Tonin liked the asylum. His friends are charming, and there's a neighbor, Martine, a young cinema extra, whom Tonin finds to his liking. Through his electrician friend, Tonin gets a job on the radio, and through his young neighbor, he even gets a job as an extra in the cinema.

Adolphe is in serious financial difficulties and the extravagances of his wife do not help to fix things.

Panorama of the programs and hosts who made the heyday of radio in the 1950s.

Eugène, who works for Radio-Europe, is a bit dim-witted. He lives in a block of flats whose caretaker is Madame Motte, and the lady is in love with the young man. Just for laughs, Eugène's friends circulate on the air the rumor that Eugène has inherited millions of francs. It does not take long before a swarm of 'friends' start mixing with him. After a while, considering that the joke has lasted long enough, the jokers reveal the truth. Eugène immediately loses all his 'friends' but not he girl he loves. Even better, Eugène actually inherits a big sum of money. He who laughs last laughs best!