Each week, Pierre and his friends host a dinner celebrating the idiocy of their guests. Each person has to bring along a guest that the others can ridicule. At the end of the evening, the "champion idiot" is selected. Tonight, Brochant is sure he has found a gem: François Pignon, who works at the Finance Ministry and is devoted to his constructions made of match sticks. But Brochant doesn't know that Pignon is a real jinx who brings on catastrophes.