Basic anatomy

Yesterday I tried to explain to Wild Thing what was going on inside his head. (Not that I understand it myself.) "Wild Thing, what's inside your head?"

WT: I don't know.

Me: Well, you have bones inside your head. And inside the bones ...

WT, interrupting: Daddy, I know YOU are inside my heart!

(I know, it's a little Hallmarkish, and he's just repeating something he picked up somewhere, but it still bought him a pretty big hug.)