The wealthy editor Pierre Brochant and his friends have a competition: every Wednesday, each of them invites the dumbest jackass he can find for dinner, where each guest is invited to talk about himself as much as possible. Later, after the guests say goodbye, the group of friends makes fun of and elects the more stupid and imbecile guest. Pierre invites François Pignon, a man that works in the Internal Revenue Service (IRS) and makes "maquettes" to forget his beloved wife, who went away with a friend of his two years ago, for the dinner. However, a tough pain in one vertebra of his spinal column does not allow Pierre to meet his friends for the game and he stays alone with the solicitous, but clumsy and stupid François in his apartment. Every attempt of François to help Pierre goes wrong, making the night a terrible nightmare for Pierre .—Claudio Carvalho, Rio de Janeiro, Brazil