My son (now aged 20) has never seen me clean shaven. When he was about 4 we were on a caravan holiday at the Yorkshire Coast. I took him over to the gents shower block to wash his face and brush his teeth. There was a man there shaving using an electric razor. My son stopped brushing his teeth and asked me @Daddy why is that man drilling his face'. He was fascinated with tools and the sound he could liken it to was my electric drill !!