"Happy, Happy, Joy, Joy" is a song originally featured in The Ren & Stimpy Show episode "Stimpy's Invention". Sung by Stinky Wizzleteats, it is Stimpy's favorite song. In "Stimpy's Invention", Stimpy picks up a vinyl record of the song and dances to it along with Ren, who is under the effects of his Happy Helmet. While Stimpy isn't looking, though, Ren eventually gets his hands on a hammer and smashes the Happy Helmet.
The song was referenced several times since then in the show as well as in the comic book.