Super Fun Happy Slide

I seem to remember an episode of the popular cartoon series The Simpsons, in which Homer travels about the USA with the famed festivals tour Lollapaloosa as a performing artist catching a cannon ball with his stomach. If I ain't mistaken, the “super fun happy slide” (nothing more than making a belly slide through mud, really – something first documented and later televised in footage from the famous first Woodstock festival) was introduced in that same episode.