The line comes from Nickelodeon's The Ren & Stimpy Show, the surreal animated series created by John Kricfalusi that premiered in 1991. Stimpy, the dim-witted and sweet-natured cat, regularly states the obvious with complete confidence, which made short quotes from the show durable meme material. As classic cartoon audio resurfaced on video platforms and soundboards, this tiny declaration became a handy label for any cat clip. It endures because the show's cult following keeps its voice lines in circulation among animation fans.