When Leo started to play hockey, Peter got into a discussion with a coach who kept shouting and yelling the whole time. The coach said: “You have to frighten the little buggers to get them to listen!” Peter said nothing. But in the car on the way home he turned to Leo and explained: “When I was little, my dad used to hit me if I spilled my milk, Leo. That didn’t teach me not to spill things. It just made me scared of milk. Remember that.”