Olivier Larry, a young cartoonist, is looking for a woman to symbolize all the avowed or secret desires of today's public. He visits the abstract painter Salvador Dalloz and inspects his models in vain. Then he goes to a photo studio of a special kind. At night, he goes through the striptease boxes, always looking for the one he can draw.

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...