Another "trick" my dad liked to pull at the most inappropriate times was to break his thumb apart. It was an optical illusion and he was good at making it look authentic. He must have practiced in front of a mirror.
I can't even describe how he did the trick, just to say that if one of his children was trying to impress a friend, dad could be counted on to make us look like idiots.
There were many times when I wanted to crawl under the dining room table!
Today I wonder how he could do that trick with his arthritic hands. I used to be able to do the same thing with my hands, but now that I've got crooked fingers, I can't do it any more at all. Maybe he called on adrenalin or something to get up the courage to bend his thumbs at odd angles to cause his children embarrassment.
As my niece puts it: Isn't that what parents are for? To embarrass their children? To that I say, No! But then she doesn't like broccoli. So I guess I have my "no embarrassment to children" banner to wave, and she has her "down with broccoli" banner to raise.
We, as a family, still have lots of fun with each other.