Worlds collide

When I was 21 and a student, I flew to Boston to stay with a penfriend. On the plane I sat next to a lady from Plymouth. We got on well, exchanged addresses, and once back in England I went to visit her for a weekend. After that, we lost touch. 7 years later, when I was living in London, a young lady who I had tutored privately for her French A -Level went off to Exeter to study. When she came home the first Christmas I saw her, asked her how she was getting on and whether she had made any good friends???. She said she had, her best friend was called Caroline, from Plymouth. I got goosebumps and asked her if Caroline had a twin brother called Peter. She said "yes". So then I was not surprised at all when I asked her my last question " ..and is her mother called Beryl?" and she said "YES" Imagine how flummoxed both of us were to realise that she had made friends with the daughter of the lady that I had made friends with 7 years previously on a flight to Boston, and with whom I had stayed..and that I had indeed met her best friend already.