This refers to when two or more people encounter each other in completely coincidental fashion. You might notice your old classmate from three countries away is now your waiter in a place you had no reason to expect them in, and you might say "wow, what a small world". You might notice two people who you know from completely different spheres miraculously know each other. You might recognize by chance that your penpal has made a cameo at a venue you're at.
But what was your most profoundly coincidental encounter?
I got into a fender bender with someone I knew from college. Spun out on ice so we meet front to front when we bumped. Once the cars stopped I swear we both practically did the cartoon eye rub of disbelief lolol.
Not mine but old school crew story. Couple of lads bumped into each other in a bar in Europe - we from the States. Neither knew the other was traveling. Heard a distinct laugh across the pub and rest is history.