This actually happened to my father, who is sadly now deceased, but it was so extraordinary that I thought I'd like to tell you about it. He was in the RAF during the Second World War and was posted to India. After his arrival there he moved around a lot, so had no contact with his family back in S. Wales for about 8 months. Eventually he was in Ceylon for a short break, and while there the mail caught up with him. On the last day he was stationed in Ceylon, he was sitting on the edge of the parade ground reading his post, while a party of recently arrived soldiers were parading.
There was a letter from my grandmother in the post telling my father that his sister had become engaged to a young man, who my grandparents had only met briefly as he'd just been called up. My grandmother also included a copy of the local newspaper, so Dad started to read it. The soldiers finished parading, and one of them came across to my Dad, and said that the Monmouthshire Free Press was his local paper too. So they got chatting, and it turned out that the young soldier came from just up the valley not that far from where my father was brought up.