Le dîner de cons

Le Dîner de Cons is French comedy play by Francis Veber.

Pierre Brochant, a Parisian publisher, attends a weekly "idiots' dinner", where guests, who are prominent Parisian businessmen, must bring along an "idiot" who the other guests can ridicule. At the end of the dinner, the evening's champion idiot is selected.

With the help of an "idiot scout", Brochant manages to find a "gem", François Pignon, a Finance Ministry employee whose passion is building replicas of landmarks with matchsticks. When Brochant starts to suffer from lower back pain, his wife, Christine, leaves him shortly before Pignon arrives at his apartment. Brochant initially wants Pignon to leave, but instead becomes reliant on him, because of his back problem, and his need to resolve his relationship problems. He solicits Pignon's assistance in making a series of telephone calls to locate his wife, but Pignon gaffes each time, including revealing the existence of Brochant's mistress, Marlene Sasseur, to his wife, Christine.

Brochant is also able to make amends with an old friend, Juste LeBlanc, from whom he stole Christine. Arriving at the apartment, LeBlanc switches between assisting Brochant, and laughing uncontrollably at his discomfiture. Brochant believes Christine has gone to Pascal Meneaux, a notorious philanderer. Brochant does not know how to locate Menaux, so Pignon tries to help by bringing in a friend, Lucien Cheval, a civil servant who has Menaux's details "on his files". Cheval arrives, but turns out to be a tax inspector, to the further distress of the wealthy Brochant, who has been evading tax, and is forced to quickly hide most of his valuables. In the act of calling the womaniser Meneaux, the tax auditor makes an unpleasant discovery about his own wife and leaves, threatening to audit Menaux and possibly Brochant as well.

Pignon eventually discovers the truth behind the dinner that Brochant wanted to take him to. His feeling are hurt, but, well-intentioned as ever, he tries to make up for all his mistakes by calling Brochant's wife, who had been involved in a car accident after leaving the apartment for the second time (the first time being when Pignon had sent her away thinking she was really Brochant's mistress). For once he makes no mistakes in this conversation, speaking emotionally and sincerely about his own marital break up (in response to which he took up his hobby), and making up almost perfect excuses on the spot.

...
Wikipedia