From BoingBoing:
Simpsons episodes open with brilliant "couch gag" sequences where the family plunk down on the living-room sofa and trigger a surreal/funny animation. The best of these, hands down, is a riff on the Eameses' classic movie "Powers of 10" (a film where the camera zooms back in order of magnitude increments, going from cells to skin to city to country to planet to solar system and so forth. The Simpsons version of this is simultaneously trippy and hilarious.