When I was growing up in Los Angeles, my family had a sailboat named the "Sweet Pea". It was a Morgan 27'. For a variety of reasons, my father sold it when I was ~12 (in 1980) to someone and it disappeared from our life.
5 years ago, or 27 years later, I was on vacation in Seattle and took my family to visit the Chittendon Locks (I love feats of engineering!) that connect Lake Union with Puget Sound. As I was excitedly explaining to my 3 young children how a lock works, I pointed in the distance to a line of boats that were heading towards the lock to exit to the Sound. As they approached, I commented that there was a boat that looked like the one I grew up with. When it was even closer, I was able to make out the color--a thick green strip at the water line--and began to get excited. Sure enough, when it got close enough, I saw the name on the boat. Sweet Pea! Since boats virtually never get renamed as it is "bad luck", I am very confident that I found the very same boat that had left my family so long ago.
In thinking about this, it is not much of a coincidence as I first imagined.