Ren & Stimpy creator John Kricfalusi is no stranger to The Simpsons, contributing a trippy couch gag in a 2011 episode.
But the animator went stranger into retro-danger with an extended couch gag for the 26th annual Halloween episode, aka “Treehouse of Horror XXVI.” “It’s different from not only anything that we’ve done, but anything I’ve ever seen him do,” Simpsons executive producer Al Jean told EW earlier this month. “His work is a very twisted homage to Hanna-Barbera, and what’s funny is he has the kids wearing Huckleberry Hound masks. We had to get clearance from the Huckleberry Hound people. Then it turns into a John Kricfalusi cartoon and a song by him. It’s one of those things where any frame you look at, you just go, ‘Wow.’ It’s meticulously made.” Check it out above and then pay your respects to Frank Grimes below.