It wasn't intentional. I wasn't doing it to try to get my son to do this. Which, perhaps, is why he ended up deciding to do it.
What has he done?
Yes, the "dreaded piano drills" that people complain of so much, I actually sought out for myself the other day. I needed something different to do and found some ones I liked. He watched or heard or something, because he is doing some of the same drills today all on his own.
What we do speaks volumes!!