event Definition and 2 Threads

Einstein's thought experiment involves a train carriage, a platform and two observers. The train carriage moves relative to the platform, and one observer is in the middle of the carriage, passing the other observer standing on the platform. When the two observers pass each other, lightning...

So, I have these two seemingly wildly improbable events that I observed. I once saw my parents next door neighbor waiting for a subway in DC. We both live 100's of miles away, and we see each other waiting for this train while randomly sightseeing. To me it seems to be a tiny probability...