I know because it happened to me this week.
I was in the living room. My five year old was sitting beside her mother on the sofa. All of the sudden, I hear the former speaking in this foreign language. Not an idiom. Music notation! She was reading aloud music! Passing off her piano homework to her mother!
“My kid knows how to read music!!” I thought to myself. “Even I don’t know how to do that!!” (Yes, there were exclamation points after all of these sentences.)
I can only imagine what other things she’ll learn as she grows older — things I never did.
You have no idea how proud this makes me as a father. It makes me want to sing “We are the world” or something. What an awesome feeling.