For Pierre Brochant and his friends, Wednesday is “Idiots' Day”. The idea is simple: each person has to bring along an idiot. The one who brings the most spectacular idiot wins the prize. Tonight, Brochant is ecstatic. He has found a gem. The ultimate idiot, “A world champion idiot!”. What Brochant doesn’t know is that Pignon is a real jinx, a past master in the art of bringing on catastrophes...
Coming out from jail, Lucas has decided to change his life and behave like a good citizen. But when he is taken hostage in a bank by a hare-brained robber, no cops can believe he is not part of the action.
After hiding his loot and getting thrown in jail, brooding outlaw Ruby befriends Quentin, a dim-witted and garrulous giant. After Quentin botches a solo escape attempt, they make a break together. Unable to shake the clumsy Quentin, Ruby is forced to take him along as he pursues his former partners in crime to avenge the death of the woman he loved and get to the money.
Caught by tabloid paparazzi with his mistress Elena, a famous and beautiful fashion model, billionaire Pierre Levasseur tries to avoid a divorce by inventing a preposterous lie. He uses the presence of a passerby in the photo to claim to his wife that it's not him Elena is seeing but the other man, one François Pignon. Pignon is a modest little man who works as a parking valet. To make the story convincing, Elena has to move in with Pignon.
A man spreads the rumor of his fake homosexuality with the aid of his neighbor, to prevent his imminent firing at his work.
A shaman from the South American rain forest visits France for a public relations campaign. In a hotel's elevator in Paris he meets a French good-for-nothing named Perrin he's fascinated with. He follows Perrin to his flat and although Perrin is not very enthusiastic about so much interest in his person, he lets the shaman spend the night in his flat. After an official meeting on the next day being part of the PR campaign the shaman suffers from a heart attack. Hardly being able to speak and laying in a hospital bed he demands to see Perrin. The latter is not very interested in meeting the shaman again. However it looks like it is to late for animosities as the shaman and Perrin seem to be tied mentally somehow since they've met in the elevator.
Unable to find her runaway son, a woman deceives two of her ex-lovers from her youth, a mild-mannered teacher and a tough journalist, that each is the real father in order to obtain their help.
Jacques and Martine, an ordinary bourgeois couple, invite to dinner a friend whom they have not seen the last ten years. Since then he has become a media star and everything has to go just right at dinner.
An unlikely friendship develops between a hitman and a suicidal guy who have both checked into the same hotel for different reasons.
Born with their immune systems damaged, Tom and Lola are doomed to live their lives in isolation, sealed in separate plastic bubbles. However, neither cold urethane nor chillier hospital technicians can keep down the beguiling spirit of these indomitable siblings.
