When I was 12 years old my mother died. I was aching and tired with grief. I would walk alone to the church to lay flowers on her grave, and another mourner gave me some change to get the bus home.
When I was a teenager my drink was spiked while I felt safe in a bar with my friends. I hazily remember being given water and cold toast, and the barman called my dad to come get me.
When I was in my 20s I flew alone to Australia. I have a fear of flying, and it took so long to get there that I saw the same sunrise twice. A stranger held my hand through severe turbulance.
Yesterday my son was screaming in a busy shop. I couldn't get him to calm down. I just held tight to him and waited for it to pass. An old man touched my shoulder and told me I was doing a good job. I've added him to my list of unforgettable strangers.