Knock Knock

I was deep in an intellectually stimulating conversation with Dorathea (4) and Jonathan (18m) at the dinner table, just the 3 of us, one evening. Dorathea had been launching knock-knock jokes at me, when suddenly she decided to launch one at her little brother. "Jonathan! - Knock, knock?" Having the restricted vocabulary of a 1-and-a-half-year-old, he replied, "Boo, beh." Without the slightest hesitation, Dorathea continues, "Interrupting cow." Jonathan [?]asked, "dah doo la dah mah da...." - "MOOOOOOO!" Dorathea interjected, and erupted into little-girl hysterics. Jonathan smiled and squealed loudly.

I think I laughed harder than they did.