Chalkboard: I will only do this once a year

Couch: A montage of a select few previously aired couch gags, culminating into the showbiz extravaganza couch gag from "Lisa's First Word"

The previously aired couch gags used in the opening are:
1) The couch gag from "A Streetcar Named Marge" where the couch turns into a brown and orange tentacled monster that swallows the whole family.
2) The couch gag from "Lisa the Beauty Queen" where Homer, Marge, and Bart run out of the film frame into an empty white space, then run back in to the scene.
3) The couch gag from "Marge vs. the Monorail" where The Simpsons sit on the couch, followed by three rows of secondary characters (such as Kent Brockman, a black-haired Princess Kashmir, Grampa Simpson, Krusty the Clown, Milhouse, Martin, Herman the military antique dealer, and the Flanders [Ned and Maude])
4) The couch gag from "Homer's Triple Bypass" where The Simpsons are microsized and climb onto the giant couch.
5) The couch gag from "Burns Verkaufen der Kraftwerk" where The Simpsons run to the couch and get scared off by a snarling Santa's Little Helper.
6) The couch gag from "Homer Goes to College" where The Simpsons get crushed by the large, paper foot from Monty Python's Flying Circus.
7) The couch gag from "A Star is Burns" where Maggie is the biggest member of the family while Homer is the smallest.
8) The couch gag from "Homer the Great" where the living room is done a la M.C. Escher's Relativity.
9) The couch gag from "Homer Badman" where The Simpsons chase after the couch as it slides down an endless hallway.
10) The couch gag from "Lisa's Rival" where The Simpsons swim to the couch.
11) The couch gag from "Bart's Comet" where The Simpsons are smiling, rubber-hosed 1930s cartoon characters.
12) The circus/showbiz extravaganza couch gag from "Lisa's First Word".

Troy McClure: Over the six years The Simpsons has been on the air, we've received dozens of letters from fans wanting to know more about the show. Tonight, we'll answer some of your questions. Professor Lawrence Pierce of the University of Chicago writes, "I think Homer gets stupider every year." That's not a question, Professor, but we'll let the viewers judge for themselves.

Mona: Do you still work for NASA?
Homer: No, I work at the nuclear plant.
Mona: Oh, Homer.
Homer: Well, you'll be happy to know I don't work very hard! Actually I'm bringing the plant down from the inside.