Every Wednesday, Pierre Brochant and his friends organize a dinner where everyone must bring an idiot. Whoever finds the most spectacular is declared the winner. This evening, Brochant is exulting, he is sure to have found the rare pearl, a world-class idiot: Francois Pignon, accountant at the Ministry of Finance and passionate about matchstick models. What he doesn't know is that Pignon is a master in the art of triggering disasters.