Have you ever seen someone you know or someone who lives near you while you've been hundreds of miles away from home?
When I was about 12, living in Georgia, we went on a summer vacation to the outer banks of NC. One of the days we drove about 2 hrs to see the southernmost lighthouse on the outerbanks. Overall unimpressive for a 12 yr old but after going to the top of the lighthouse to look, I turned around and saw the girl that sat in front of me in math class.
This also happened to me 2 yrs earlier at Disney World. Saw one of my neighbors in line for one of the rides. Had no idea his family would be there.