"Ha ha!" couch gag

The "Ha ha!" couch gag is the twelfth couch gag of Season 9.

Plot
The Simpsons go to sit on the couch, but fall on their butts when the couch gets pulled back. Nelson Muntz comes from behind the couch and laughs.

Character Appearances

 * Homer Simpson
 * Marge Simpson
 * Bart Simpson
 * Lisa Simpson
 * Maggie Simpson
 * Nelson Muntz