Les Gaietés de l'exposition

A pompous grocer’s assistant in Marseille annoys a visiting film crew so much that they prank him with a phony acting contract; believing it to be real, the “schpountz” heads to Paris for his new career.

Nelson Hibbert expects to become the new president of Nagel Industries, but Mr. Nagel gives the promotion to another employee. When Nelson barges into Nagel's office to confront him, he finds Nagel's been murdered. Fearing that he will be implicated, Nelson decides to run from the law...despite the fact that the police already know the killer's identity.

Jobless loner Eddie Vuibert gets a lucky break when a rich Jewish entrepreneur mistakes him for a Jew and gives him a sweet job in the Parisian fashion district.

Alphonse Tram is unwittingly involved in several murders despite having no memory of committing the crimes. His confusion lead him to confess to his neighbour, Inspector Morvandieu. Alphonse and Morvandieu become the axis around which murders occur.

The whole intrigue is centered around carte-blanche documents kept in a vault. Whoever fills in the blank becomes the owner of a revue. Big money is involved. The nephew of the owner of the vault is trying to cheat his uncle and have his name in the documents. Everything is even more complicated because the manager of the bank has a finger in the pie, too. Who but a humble bank-teller (Pierre Richard) will ruin the scheme?