While we were on holiday Charles took Jack to a public bathroom and waited in the stall while Jack finished his business. Here is the conversation that occurred while Jack was on the pot:
Jack: Dad, do you remember when I was three? (He is three-and-a-half now, nothing less!)
Charles: Yes, I remember when you were three.
Jack: Yes, when I was three I had to hold the banister when I walked down the stairs, but now I don't have to because I am three-and-a-half.
What on earth made him think of this while he was sitting on the toilet?????