The sound comes from the animated sitcom Family Guy, in which Stewie Griffin repeatedly teases his dim-witted brother Chris. The 'count to ten' bit grew out of the show's long-running joke about Chris's slow-wittedness and began circulating as a standalone reaction clip on meme pages and soundboards. Creators use it to needle friends, punctuate fails, and caption comedy videos where someone takes too long to grasp something simple. Because the voices are so distinctive, it reads as funny even without any visual, which is why it has survived as a short audio meme.