Knock Knock

Scene:
Husband and I are speaking to each other.
Son runs up and wants my attention.
Son: "Mommy, mommy, mommy, mommy."
I say "Just a minute" and continue conversation with Husband.
Son (at my feet, looking up at me): "Knock knock, who's there? Knock knock, who's there? Knock knock, who's there?"

Where does he come up with such cuteness?