The line comes from French comedy duo Chevallier et Laspalès, with Philippe Chevallier delivering the denial in one of their stage sketches. The duo built a large following in France with character-driven sketches built around misunderstandings, repetition and overblown reactions. As short clips from their routines began circulating on soundboards and social media, this brief outburst became a handy French-language reaction sound. It remains popular because the phrasing is instantly recognisable to French-speaking viewers and the delivery needs no context to sound funny.