long lost cousin on a plane

My last name is unusual. I'd say there are maybe 3 or 4 dozen people in the country with it, based on some googling. It's not even a very common name in the region my family came from. One day I was on a flight back from a conference on an airline with open seating. It was a two leg flight, both on the same plane. Between legs, the flight attendants take a head count to make sure they have the right number of through passengers before letting the new ones on. The count that day was off, so they needed to check names against the manifest. When they came to my row, the woman about my age seated next to me, whom I had not spoken to, and would not have otherwise, had the same last name as me. It turned out our great grandparents had been cousins, had a falling out, and the branches of the family hadn't spoken in 70 or 80 years. And we were seated next to each other on a two leg flight, where the passenger count happened to be off and they needed to check names.