Lots of different examples

Here are a few examples: Me and my ex-partner met a couple in Antigua in 1988 - they were getting married on the day of my 30th birthday so asked us to act as witnesses as no one else was with them. A few years later we were at the airport leaving Florida and bumped into them as we both waited for a plane heading home to different UK airports. Another time I was backstage at a major music concert miles from where I live as my (then) partner was marketing the band. Suddenly someone called my name and it turned out to be a man who had been in my class at school and had had a major crush on me. He was there managing the support band. I worked as a therapist and lived about 20 miles from where I grew up on the outskirts of London. A client told me some information about a man she was having an affair with, and - on checking some of the facts - it turns out it was someone who had dated my sister for years in her teens/twenties. Needless to say I wasn't able to tell either party!