The Sword in the Stone couch gag is the second couch gag of Season 23.
A sword is stuck in the couch. The Simpson family comes in as usual, and Homer tries to remove the sword, but to no avail. Ned Flanders walks in and removes the sword, which has a label on it that says "Property of Ned Flanders". As he leaves, a not amused Homer glares at him while the rest of the family sits on the couch. He then slouches on the couch, crosses his arms and grunts.