This is all true!
In 2004, I was having lunch in Southwest London with Rosie, a young American woman, whom I'd met (briefly) the previous year when I was living in Canada. We'd met fleetingly, at a coffee shop in Vancouver, and bumped into each other again a few days later, (at which point we swapped email addresses). Given she lived in the US, I doubted that I’d ever meet her again.
Unexpectedly, Rosie got in touch to inform me she was visiting London, so we arranged to meet. During our friendly reunion, our conversation turned to serendipity .... I had recently begun a relationship with a woman I had met, by chance, at Waterloo train station. During this journey, it was clear there a mutual 'interest'. Still, ‘carriage courage’ deserted me and as she alighted the train I resigned to the fact our paths may not cross. Fortunately, my 'expired' ticket, purchased hours earlier, failed to get me through the barrier and I was forced to turn to join the queue to speak to the guard: she was, much to my pleasure, also in the queue, and conversation began.