Employed in a beauty salon, Amédée must undergo a pentothal injection. The dose is too strong; suddenly Amédée reveals the truth to everyone; to clients of the institute; to his cheating wife; to his boss that he robs; to the tax collector; etc. When the effects of the truth serum wear off, everyone returns contentedly to their little swamp.
as Amédée
as Mareuil
as Ange-Louis
as Jacqueline
as Monique Castapoul
as Doctor
as Castapoul
as Georges
as Inspector
as Mr. Legros
as Inspector
as Photographer
as Forensic pathologist
as Étienne
as Friend
as Saleswoman
as Aunt Eugénie
as Amélie
as (uncredited)
as Un ami (uncredited)
as Un ouvrier de l'institut (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as Une invitée (uncredited)
