The Transformers couch gag is the thirteenth couch gag of Season 16.
Five toy vehicles (a semi-trailer truck, a F-16 Fighting Falcon, a Jeep Wrangler, a Volkswagen Beetle and a Porsche 935) arrive in the living room, only to change Transformers-style into the Simpson family. They then sit on the couch as usual. Regarding the vehicle modes, the characters closely resemble 5 Autobots. Optimus Prime, Jetfire, (Blue) Bumblebee, (Green) Jazz, and (Orange) Hound.
After the vehicles transform into the family, they resemble five characters from the Transformers toy series. Homer is Optimus Prime, Marge is Jetfire, Lisa is an orange Hound, Maggie is a blue Bumblebee and Bart is a green Jazz.