Just arrived back from Florida and whilst in Disney's Epcot, in the queue for Soarin', we bumped into a girl who used to be in my daughter's primary school class a couple of years ago.
Bumped into 2 work colleagues in Cairo some years ago. Did know they would be out there, but it was still quite surreal seeing them.
Got chatting to an English couple out in New York on an organised bar crawl. Didn't know them, but turned out they were from Handcross, just down the road from me in Crawley.
On staying at a B&B in the countryside in Jersey with my girlfriend, we were astonished to find a very good friend of mine and his wife booked in there too.