Triple coincidence

Dear Professor Spiegelhalter, I was fascinated by The Life Scientific this morning especially coincidence. Here's another one: A month ago we were in The George, a wonderful old pub in Norton St. Philip in Somerset for a family meal. I started a conversation with another customer about medieval pubs and he mentioned The Fighting Cocks in St Albans. My husband was educated at St. Albans Grammar ( now Verulam school ) and it transpired that, not only was this guy educated there too, albeit at a different time, but also worked at De Havilland in Hatfield, when it still existed, where my husband's father worked years ago. Having finished the conversation, a guy from the next table got up, came over to us and said, "I couldn't help hearing your conversation. I was at the Verulam School too!" So ensued another conversation about remembered members of staff. I think our daughter wondered if she was ever going to get to eat! We wondered about the probability of three people from different parts of the country meeting in a Somerset pub, having been in the same place years ago although not at the same time. Myra Miller.