I don't remember when I started besting my father. I don't recall when I became a faster runner or when my Scrabble skills eclipsed his. Sometimes it doesn't come down to one particular moment.
Sometimes it does though.
Larry: Ok, Daisy, let's hear it.
Daisy: Ok! 3.14159 26535 8979 3238 46264 33832 7950 2884 1971 693993 7510.... Dad, that's as far as you know it, right?
Me: Grrrrr. Yes.
Daisy: .... 5820!