While on a family holiday in Australia with our 3 children in 1993, we booked ourselves on to a boat trip for the day. As we boarded the boat, we heard English voices up ahead ( the only other English people on the boat!). It was a big boat and our paths didn't cross with the 3 couples (all friends) until after lunch. A dingy took people to the island for a swim, 12 at a time, and yes, you've guessed it, we were in the boat with them.
It turned out that 2 of the couples were visiting the 3rd, who had emigrated years before, and were all old friends.