The Simpsons goes into ever stranger territory with the couch gag for this year's "Treehouse of Horror" episode. Enlisting the weird and wonderful talents of Ren & Stimpy creator John Kracfalusi, the gag sees Bart, Lisa and Maggie trick-or-treating, before being cornered by a gang of ghosts and having their insides eaten by the mega-zombie Frank "Grimey" Grimes. Enjoy the video above.