When I was going to art school I saw Don Hertzfeldt’s 2000 short Rejected and it is roll on the floor hilarious. I was just learning animation and Mr. Hertzfeldt was inspiring many of my colleagues in their school animations. Kudos to the Simpson’s brass for allowing Hertzfeldt to just go nuts with this couch gag. I wonder if they just let him do whatever he wanted or if they had any editorial notes on the final product.
For easy access here is the short Rejected.