- "The sooner kids talk, the sooner they talk back. I hope you never say a word."
- ―Homer to Maggie
- ―Maggie (after Homer leaves)
"Lisa's First Word" is the tenth episode of season 4. It originally aired on December 3, 1992. The episode was written by Jeff Martin and directed by Mark Kirkland.
While trying to get Maggie to say her first words, Homer recalls what happened a few years back when Lisa was born, when they first moved into their present home, and what Lisa said her first words.
When Homer, Marge, Bart, and Lisa unsuccessfully try to get Maggie to speak, Marge tells the family the story of when Lisa said her first word. Marge begins telling the story of how Lisa learned to talk by describing the spring of 1983 as a time when "Ms. Pac-man struck a blow for women's rights." It is March 1983, and Homer, Marge, and Bart lived in the Lower East Side. One day, Marge says that she is awaiting another baby, with Bart imagines a new brother who he can use as a scapegoat for his own misbehavior. But as Marge is pregnant, she feels that the Simpsons are going to need a bigger house. Homer and Marge try to look for houses, including a houseboat that Horatio McCallister has until now. After unsuccessful attempts, the Simpsons find a house on Evergreen Terrace and buy it with a $15,000 down payment from the sale of Grampa's house.
In 1984, the Simpsons move into their new Evergreen Terrace home, with the Flanders family as neighbors. Flanders has just bought a TV tray from the hardware store, and Homer borrows the tray from him for "a little while". (Years later, in the present, the tray is still in the Simpsons' living room.) Bart turns two years old, and for the first time, he watches Krusty the Clown, as well as Itchy & Scratchy. Krusty does a promotion for the 1984 Summer Olympic Games with his Krusty Burger chain, which is the "Official Meat-Flavored Sandwich of the 1984 Olympics." The promotion offers scratch-and-win game cards in which people can scrape off the name of the event from the game card, and if the U.S. wins a gold medal, that person wins a free Krusty Burger. However, the Soviet Union boycott the Olympics, and with this the U.S easily dominates every event, Krusty's accountant tells him he will lose $44 million due to the promotion. On air, Krusty angrily says he will personally spit in every 50th burger. Homer, however, finds those odds to be acceptable, and continues getting a steady supply of free Krusty Burgers from redeeming his winning game cards.
Bart is asked to give up his crib so it can become the new baby's. Homer builds Bart a new bed in the shape of a clown, which frightens Bart. Marge thinks that the baby is coming, and she and Homer go to the hospital, leaving Bart with the Flanders family. He goes home and is scared until Homer asks him to see Lisa. Bart thinks that he hates Lisa. Everyone, except Bart, agrees that she is a beautiful baby. Later, Bart plays pranks things to Lisa - giving her a haircut with household scissors, sticking stamps on her, and sticking her through the Flanders' doggy door — and is punished. He blames Lisa for his problems and leaves, until she says her first word, "Bart." Bart discovers that Lisa can talk, and she can even say "David Hasselhoff", "Mommy", and "Homer" but not "daddy", much to her father's annoyance. After this, Bart holds baby Lisa for the very first time, and seems to appreciate her more from then on.
However, back in the present day, the flashback ends and Bart and Lisa are fighting. Homer takes Maggie to bed, saying that "the sooner kids talk, the sooner they talk back", and that he hopes that Maggie never says a word. When he leaves her bedroom, however, Maggie removes her pacifier and says "Daddy."