Overheard in the Kitchen

If you were a fly on the wall at my house, here's what you would overhear:

Four Year Old Boy: "What is the most important part of your body?"
Me: "Your brain"
Four Year Old Boy: "Oh I thought it was your heart"
Me: "Oh that’s important, maybe it is your heart"
Four Year Old Boy (after thirty seconds of consideration) "Yeah if you didn’t have a brain you would just crash into walls and stuff."

Meaningful conversation has a place in my house. I just don't know where it is.

And I obviously don't know the most important part of the human body either.