For some time, I have been interested in the concept of book crossing. The idea is that you register a book on a special Web site and then leave it somewhere for someone to find. Then they can register its "capture" and may add a review to the site and "release" it themselves later. Books thus travel around and develop a life of their own.
I have released quite a few books and had the odd one found. But today I made my first "catch". I registered to get "release alerts" for books left in Cheltenham, where I happened to be going this afternoon. We went to the right spot and there it was.
The only downside is that the book was Angels and Demons by Dan Brown - a popular author, but not one of my favourites! The registration was 126-4363000.