Kars4Kids is a car donation charity in the United States, and its short radio and television jingle became widely known because it aired so often and stuck in listeners' heads. Online, the tune was picked up as a meme for its cheerful, slightly grating catchiness, with creators using it to joke about unwanted earworms, annoying adverts and bad trades. Its staying power comes from that shared recognition: almost everyone who hears the first few notes knows exactly what is coming, which makes it an instant punchline in short videos.