This film originated as a play in Paris. The story focuses on the one-day adventures of Bertrand Barnier played with a genius of French cinema, Louis de Funes. In the same morning he learns that his daughter is pregnant, an employee stole a large amount of money from his company, his maid is about to resign in order to marry a wealthy neighbor and his body builder is interested in marrying his daughter. The seemingly complicated story-line is full of comedy or errors and some of the most hilarious mime scenes of the French cinema.

During a stopover in Aden, a charming actress is kidnapped by an Arab prince.

A bank clerk is bored to death with his nine-to-five work under his boss ' watchful eye. His missus is a pain in the neck and his in-laws are not better.

While Henri was a POW during the war, his wife passed away, and he returned to face the challenges of bringing up three children alone. Henri may get drunk and angry at times, but he also has a better side that will not stay buried.

After being hurt in the face, Count de Roger Tinchebraye is forced to hide his disfigured face behind a leather mask. Dispirited for a while, he decides to become a Casanova-like seductor. When he meets true love, cynical Roger does not believe in it and lets pure Judith marry an old marquis. But once Judith's husband dies, he sees Judith again, shows her his disfigured face, which does not discourage the young woman from loving him. Nevertheless, he distances himself from her forever

A famous singer disappears in a plane crash. Her two little girls are given a new home by their grandfather. Unfortunately the good man has an old housekeeper who goes out of her way to make their lives impossible. In desperation the two brats run away to Paris. Meanwhile, the girl's father manages to steal important documents. In the end, Gaby and Ginette track down their mother who had not got killed at all. All is well that ends well.

Philippe, an employee at the Bourdinet firm, having been caught kissing Jacqueline, his boss's daughter, is fired. Some time later, Bourdinet launches a radio quiz show to boost his business. Philippe then decides to compete in the hope of telling the thousands of listeners what he thinks of the industrialist. A blow on the head having given him a gift of second sight, the competitor becomes impeccable and wins astronomical sums to the great despair of Bourdinet. Everything will work out in the end and Philippe will be able to marry Jacqueline.

A Russian spy is sent out to steal sensitive information from NATO about military mobilization. Without much intelligence of his own, the distrusted agent of Soviet intelligence needs all the help he can get from his "talented" partner Penelope Lightfeather as they scatter around the French countryside for secret rendez-vous' while trying to avoid being caught by counter intelligence agents and distrustful communist operatives.

In a girls boarding-school run by Madame Piégeois, young Gisèle meets, at night, the count of Champrès' son.

While celebrating his birthday, police inspector Basquier recalls two of his most celebrated cases. The first involves duplicitous moneylender Olga. The second concerns the brutal broad daylight murder of innocent young Yvonne.