Prof. Henri Laborit uses the stories of the lives of three people to discuss behaviorist theories of survival, combat, rewards and punishment, and anxiety. René is a technical manager at a textile factory and must face the anxiety caused by corporate downsizing. Janine is a self-educated actress/stylist who learns that the wife of her lover is dying and must decide to let them reunite. Jean is a controversial career-climbing writer/politician at a crossroads in life.

Éder is arrested after confessing the murder of a man. Duca, his nephew, is sure that his uncle confessed the crime to protect his girlfriend, Soraya, ex-wife of the deceased, so he enlists two of his friends to help prove his theory.

Genial, bumbling Monsieur Hulot loves his top-floor apartment in a grimy corner of the city, and cannot fathom why his sister's family has moved to the suburbs. Their house is an ultra-modern nightmare, which Hulot only visits for the sake of stealing away his rambunctious young nephew. Hulot's sister, however, wants to win him over to her new way of life, and conspires to set him up with a wife and job.

Benjamin is in love with Manette, the innkeeper's beautiful daughter, but she has no intention of giving in to the young doctor until she sees the marriage contract, and marriage does not fit in with Benjamin's spirit of independence. For the same reason he resists the efforts of his sister Bettine to marry him off to Arabelle, the daughter of old Dr. Minxit. Benjamin does agree to go and meet the girl. But that evening his sister finds him at the inn together with Manette, who is arrested by her father. So she decides to go with Benjamin herself. But as result of an incident with the fat Marquis puts paid to the expedition. Benjamin is subjected by the Marquis to a humiliating practical joke. Benjamin is determined to got his revenge. He succeeds thanks to the gorgeous Vicomte Hector de Pont-Cassé, who also helps Manette with her problems against her father. But Benjamin is now arrested by the Marquis...

Hyacinth, a former matador who lives miserably with his nephew Pepote, receives a letter reminding him that, as agreed a few days before, he must participate in a bullfight to be held that same afternoon.