the menu in An Amazing Meeting

Some years ago my wife and I were returning from a holiday on the Isle of Wight. We caught an earlier ferry than the one that had been prebooked, and on the return journey to Cheshire, we stopped at a public house for a quick meal. However, the menu available was not to our liking so we left immediately to find another place to eat. As we were approaching the Bristol area (not on the motorway), my wife mentioned that she wished to visit a toilet and remarked that if she knew the location of the parents of our son's girlfriend, (who we knew lived in the Bristol area, but no idea where) we could visit them to use their toilet. Within minutes we were approaching a roundabout when I noticed that the car exactly in front of us was our son's. His girlfriend (who was the passenger) simultaneously stated to my son that the car behind was just like his parents, and when he looked in the mirror, he confirmed that they were his parents. So we followed them back to the girlfriend's parents house which was within a quarter of a mile of the roundabout, and my wife was relieved!! What a coincidence on timing and location.