Dr Nick Riviera is the cheerful, unreliable doctor from the long-running animated series The Simpsons, and his entrance greeting became one of the show's most repeated running gags. In episode after episode, his bright hello is met with an equally enthusiastic reply from patients, colleagues or a waiting room, turning a medical visit into a comedy routine. Clips of the exchange later circulated on meme pages and soundboards, where editors reused it as a ready-made welcome for new characters, streamers and friends. Its staying power comes from that instant recognition and the warm, silly energy of the call and response.