The line comes from Family Guy, the long running animated comedy centred on Peter Griffin and his family in Quahog. A short excerpt began circulating online as a reaction clip, where users isolate Peter's pronunciation of Petah and the horse announcement from the surrounding scene. Shared on meme pages and soundboards, it spread because the phrase works without context and can be dropped into unrelated videos. It remains popular for entrances and reveals, where the familiar cartoon voice signals a joke before anything else happens on screen.