The phrase comes from Kaamelott, the French comedy series created by Alexandre Astier that first aired in 2005, where Perceval, played by Franck Pitiot, often responds with C'est pas faux when he only half understands a discussion. The line became one of the show's best-known catchphrases and spread through French clips, compilations, and reaction edits long after the series ended. It endures because it works in both French and subtitled contexts as a universal shrug of reluctant agreement, instantly recognisable to fans of the series.