An Anatomy Lesson

Tucker: Do you have a testicle in your head mommy?
Me: Nope. But I have a brain in my head.
Tucker: Do I have a testicle in MY head?
Me: No, you have a brain too.
Tucker: Do I have a testicle?
Me: Yes. You have two of them, remember?
Tucker: Oh yes, yes, yes. Does daddy have a testicle in his head?
Me: {pondering} Yup. ;)