The theme comes from Courage the Cowardly Dog, the Cartoon Network series that ran from 1999 to 2002 about a fearful pink dog guarding Muriel and Eustace in the isolated town of Nowhere. Its tense background score became closely linked with moments when an ordinary day suddenly turned threatening. Clips of that music later circulated as short meme sounds, often labelled with the word run, and editors now reuse the fourteen-second excerpt to signal an approaching crisis without needing any dialogue or context from the original episode.