A shy, penniless employee of the garage owner Grillot, the gentle Louis wins $10 million in the lottery. Flitting along the banks of the Seine, he takes in Raoul Grandvivier, an unknown, untalented painter who has just botched a spectacular suicide intended to draw attention to himself. Raoul takes him back to his studio, where he meets his charming daughter Lucie. In order to see Lucie again, with whom he is in love, Louis offers to sell the paintings. In reality, he's the one paying for them, to make it look like a wealthy art lover.
Jules Duraton is the headmaster of Chatelbourg's high school. He is happily married, has a teenage daughter named Solange, and everything would be for the best of all possible worlds if he and his family were not the namesakes of the protagonists of a famous comic series broadcast every day on Radio Monde "La Famille Duraton". Day after day, the real-life Duratons are made fun of because of their surname and Jules just can't take it any more. That is why he decides to sue the radio station responsible for his misfortune.