Jack's First Joke

Jack spontaneously told his first joke in the car on the way home from daycare today. 

Jack: Knock Knock

Ma: Come in

Jack: No, Mummy! Knock Knock

Ma: Oh, Who's there?

Jack: Jack

Ma: Jack who?

Jack: Jack Duncan! HA HA

And then there were knock knock jokes all afternoon. He even wanted to call Nan R to tell her one. 

I had to call daycare and ask if they had taught him that or if he got it from watching tv and Rose said that the 3 and 4 yr old boys had been telling knock knock jokes in the morning so Jack had obviously picked it up from them.