The clip comes from The Simpsons, the long-running animated series centred on the Simpson family in Springfield, with Homer as the father known for blunt, lazy reactions. C'est nul is taken from the French version, which is why the line is in French rather than English. Online it sits alongside other Simpsons reaction sounds like Nelson's HA-HA, shared by French-speaking fans and editors who need a quick dismissal. It stays popular because Homer's voice is recognisable even to viewers who do not speak French, and the meaning is clear from his tone.