A man is too shy to ask a girl out and decides to kill himself. While lying in the road he is rescued by a Doctor who tries to cure him by implanting the heart of a rooster into him, something which suddenly makes him irresistible to women.

Agnès Bonnardet leaves her parents to marry Claude Sironi, a painter who becomes famous but loses his talent. Meanwhile Agnes acquires a style of her own as an artist, which makes Claude jealous of his young wife. One day, he sends one of his own paintings to the Bazar de la Charité, a very trendy Paris department store, instead of one of his wife's works as ordered. Afraid of her being mad at him, he locks her up in the cloak room. A dreadful fire suddenly breaks out and sets the building ablaze.

April fools in a studio where a radio host pretends to shoot dead all the performers....till a true crime occurs.

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!

Olivier Cabrol is an immature young reveler who lives from hand to mouth. One day he inherits a fabulous fortune from an eccentric uncle. But on the one condition to spend a certain amount of time as a tramp. Olivier accepts out of sheer greed but soon finds the experience rewarding. He finds himself as well as new friends (true ones this time) and even love in the person of Colette.

Mario is a former gangster turned garage owner. His former accomplices ask him to murder Magali, their leader 's mistress,who intends to turn her lover in.