In a spoof of Planet of the Apes, the Simpsons are being chased by couches through a field, until they are caught and imprisoned. The Simpsons' couch breaks them out, and leads the family to a buried Lard Lad statue. Homer then grabs a rock and slams it on the couch, making it unconscious. The Simpson family sits on the couch.
This couch gag was made by a collaboration between The Simpsons and Google when Google asked the producers to make a virtual experience with a couch gag. The producers decided to use this couch gag that was already finished, but was adapted to VR.
Ironically, this couch gag was aired two weeks after the airing of an episode focused around virtual reality.
The couch gag is a parody of the 1968 film Planet of the Apes.