Doesn't take much for folks to proclaim: "It's a small world!" I'm not sure who originated this expression, but his legacy is a pox on all our tongues.
Any little encounter that has any connection to us in any way makes us think that even with 7 billion Earthlings, our planet is really just a snow globe. Sorry to spoil it for the romantics out there, but it isn't that neat and clean. Odd connections from far flung places do occur. What you forget is that five years went by before your stepcousin met that person who grew up four counties away from that summer camp you went to for half an August. During those five years, you encountered thousands of people who had no connection to you whatsoever. But you didn't count them or the amount of time that passed. Mentally, you hit pause as you waited for the next "small world" encounter, and responded as though it came right on the heels of the last one. Our brains seem to have a cryogenics lab that preserves these contrived patterns and chronologies, and it fools us regularly.
But don't despair, you can still take your kids on the It's A Small World ride. Just make sure you tell them it's a lie (like everything at Disneyland).