Typical, and yet not.

Sunday morning, breakfast time. Dajadaddy and the dajamou are talking about today's outing to the local Fairy Festival. Note that we've been discussing it ALL MORNING.

Daddy: You know what we're doing today?

Daja: What?

Daddy: We're going to the fairy thingy!

Daja: It's not a thingy, Daddy, it's a fest-a-bull!

(Daddy launches into an explanation of how the category "thingy" includes the subset "festival.")

Daja: It's a fest-a-bull, Daddy! (sigh of exasperation)

Daddy: I'm going to have to teach you about Venn diagrams very soon now.

Mama: I don't know what that is. What's a Venn diagram?

Daddy: Oh. My. God. You don't know what a Venn diagram is?

Mama: Nope. What's a Venn diagram?

(Daddy hurls himself at the dry-erase board, normally used for grocery lists, but occasionally employed as a teaching tool and art medium. He draws 2 circles on the board.)

Daddy: This circle is the set, "Everyone who knows what a Venn diagram is." And this is the set, "Mama."

(Mama simultaneously gets it and collapses into gales of laughter. Everyone else is standing around wondering what's so funny.)