When I was about 9, a friend of mine at the time was a girl called (for the sake of this) Mona. It was nearing the end of term, and I was heading off for a week in France with my family. We stayed in this small village, with only about 20 houses in the nearby region. You can imagine my surprise when we got there, and we found that inside the neighbouring house was my friend Mona and her family, also staying in the village! The two families hadn't collaborated or planned it, it had just occured.