I was out walking with my then 4 year old daughter. She picked up something off the ground and started to put it in her mouth. I asked her not to do that.
"Because it's been laying outside and is dirty and probably has germs."
At this point, she looked at me with total admiration and asked:
"Wow! How do you know all this stuff?"
"Uh," I was thinking quickly...everyone knows this stuff.
"Um, it's on the Mommy test. You have to know it, or they don't let you be a Mommy."
We walked along in silence for 2 or 3 minutes,
but she was evidently pondering this new information.
"I get it!" she beamed.
"Then if you flunk, you have to be the Daddy."