The living room is at the center of an M.C. Escher's Relativity style environment with multiple staircases and conflicting perspectives; the family enters from various directions (and dimensions) and sits.
Homer, Marge, Bart, Lisa, Maggie, Grampa (who’s sleeping), Santa's Little Helper, and Snowball II are in a Brady Bunch-style nine-square grid, with the couch in the center square. Everyone (except Grampa) runs to the center square.
The whole scene is a Simpsons rendition of The Beatles' Sgt. Pepper album, featuring a large crowd of regulars, several objects associated with the show, wax statues of the Simpsons as they were on The Tracey Ullman Show. The last chord to the Beatles song, "A Day in the Life" plays instead of the traditional Simpsons music as the family comes in, standing front and center and dressed in Sgt. Pepper regalia. Homer looks around and turns to look at the crowded scene behind him.
The family sits down, but now Bart is green. Homer fiddles with the TV antenna and Bart changes to red. Homer then returns to the couch, and smacks Bart in the back of the head in order to return him to his normal color (yellow).
The couch is now a giant Whack-A-Mole game, with The Simpson family as the moles. The clown hallucination music from the season six episode “Homie the Clown” plays as an unseen player tries to hit one of the Simpson moles — and successfully gets Homer.
The living room is in an “America Onlink” window on a computer screen. An unseen computer user tries to download the family, but the download shows no signs of progress after a few seconds and the user tries to exit the window (which also doesn’t work).
The couch is on the deck of a ship at sea in rough waters, sliding back and forth with the tilt of the ship. The family, dressed in rain gear, sits on the couch, before an enormous wave washes them away. The TV surfaces moments later.
The family comes in, dressed as the Harlem Globetrotters, passing a basketball to each other while Sweet Georgia Brown plays. Maggie dunks the ball into the basket above the couch, hitting Homer on the head.
Homer runs in alone and stands in front of the couch. The top half of him pops off and on to the couch revealing a smaller Marge standing inside the lower half of Homer, like a Russian nesting doll. The top half of Marge pops off revealing Bart, whose top half pops off revealing Lisa, whose top half finally pops off to reveal Maggie, who stays in the middle of Homer’s body and sucks on her pacifier.
The Simpsons sit on the couch. Metal shackles restrain their wrists and ankles and a metal cap comes down on all of their heads. The family writhes in pain as they get electrocuted. (Halloween episode)
The Simpsons sit on the couch as normal. The camera zooms out and reveals that the living room is part of a snow globe that two hands shake to make the snow fall. (Christmas episode for this first usage)
The floor is a treadmill. Marge, Lisa, Bart, and Maggie run in place for a few seconds, then successfully dismount, while Homer gets stuck on it, yelling, "Marge, stop this crazy thing!" a la George Jetson in the original closing credits of The Jetsons.
Similar to the couch gag on "Homer's Triple Bypass", the Simpsons are minimized and trying to get on the giant couch. Unlike the couch gag to "Homer's Triple Bypass," The Simpsons take a little longer to climb onto the couch and, once they reach the top, Santa's Little Helper grabs Homer and carries him away in his mouth.
The Simpsons are frogs (with Maggie as a tadpole) jumping to a lily pad "couch. Homer turns on the TV with his tongue. (according to the season 9 DVD commentary, Dan Castellaneta's daughter came up with the idea for this couch gag)
A vine growns in the middle of the living room and sprouts into a tree bearing Simpsons family versions of various fruits and vegetables: Bart is a strawberry, Homer is a squash, Marge is an asparagus, Maggie is broccoli, and Lisa is a pineapple.
In a parody of the Rocky & Bullwinkle bumpers, The Simpsons fall off a cliff during a lightning storm as the Rocky & Bullwinkle theme plays throughout. Their eyes are shown floating towards the heavens. The scene then cuts to The Simpsons sprouting from the ground amidst a garden of flowers. Bart spits up a clod of dirt.
The Simpson family find themselves in Mrs. Krabappel's classroom where Bart is writing the blackboard punishment phrase, "I will not mess with the opening credits", making a chalkboard gag within a couch gag.
Similar to the couch gag in Marge vs. the Monorail, the living room is filled with supporting characters from the show. Unlike the episode, the living room is now a movie theater and the Simpsons are shuffling their way through to find a seat. After they sit down, Homer leans in and eats from the Comic Book Guy's popcorn tub.
The family never makes it to the couch; Bart falls off of his skateboard. Lisa gets catapulted into the garage roof, and Homer gets run down by Marge(with Maggie next to her as they honk horns) as she drives into the garage. Meanwhile, in the living room Freddy Krueger (of the A Nightmare on Elm Street movies) and Jason Voorhees (of the Friday the 13th movies) sit on the couch, wondering where the family is.
The family sits. Salon-style hair dryers descend onto their heads, then lift up, revealing the family members all have swapped hairdos. Homer has Maggie's spikes, Marge has Bart's spikes, Bart has Lisa's spikes, Lisa has Homer's "combover," and Maggie has Marge's big, blue bouffant (the weight of which causes Maggie to fall off the couch).
In a parody of the famous scene in Dr. Strangelove where Slim Pickens’ character rides the bomb, the Simpsons (wearing white cowboy hats) straddle the couch as it drops from a bomb bay door. The Simpsons scream, “Yahoo!” as they plummet into oblivion.
The living room is in shallow water and the Simpsons sit on the couch. When an iceberg floats by, the couch sinks vertically like the RMS Titanic and the family clings to dear life as it goes under. Maggie resurfaces on a couch cushion moments later with the remote control in hand.