I went to summer camp with a girl who got a call that her brother had been in a serious car accident back home. A few years later, my college roommate invited me home with her for the weekend, where I met her BF for the first time. When I heard his last name, I asked him if he was related to the girl from summer camp. Turns out HE was the brother! Too weird!
Also I ran into a friend of a friend at Philadelphia airport. I was returning home from WDW, she was coming back from a trip to Tallahassee to visit relatives. We were on the same flight from Philly to Syracuse but neither one knew the other one would be there.
Another time, I ran into my friend's cousin at JFK airport coming back from Florida. I was heading back north and she was going down to their time share in Stuart, FL. Not terribly unusual since they live just outside NYC, but it was odd b/c I didn't know they'd be traveling that night and never expected to run into anyone I knew.
The World is a book. Those who do not travel read only a page." - Augustine