hallway serenade

I heard the usual phrase called out to me this morning down the hallway: "Mommy! What you doing?". And then I heard, louder, "a chick chick here and a chick chick here" and I wondered what in the world when all of a sudden I heard "Old McDonald had a farm E-I-E-I-E-O" and after several choruses involving a chicken, he started saying "with a hee haw here and a hee haw here" and even eventually got the 'E-I-E-I-O' right. I joined in, singing along with him from my bed--he'd call out an animal and we'd do sing about that one together. It's a good thing we live in a house and not an apartment.