(Strip Number 1619, Original Publication Date, 6 July 1989)
Panel 1: As John leaves for work, Elly holds Lizzie up so she can look at him and exhorts her to "Say Da-da, Elizabeth! There's Da-Da!"
Panel 2: She goes on to say "Yes, Da-Da. It's Da-Da!"
Panel 3: As he walks down the driveway, Elly tells Lizzie to say bye to Da-Da. When she concludes the departure process by saying Bye-bye, Da-Da, snarker-troll fungus people in basements come to their cruel and hateful conclusion that Elly has just taught Lizzie that the word "Da-Da" means "man" as a category instead of John as a person.
Panel 4: A little while later, we evil people are proven right when Lizzie calls Eddie The Grocer "Da-Da!" and shocks and saddens and confuses Elly.
Summary: Elly never seems to quite understand how children's brains develop. Today, it takes the form of her thinking that Lizzie is trying to make her look bad by "pretending" that she uses Da-Da to mean "adult male human" when she "knows" it means John. Five years from now, it takes the form of getting pissed at April forever because she acts as if she doesn't know that "someone" means "her."