Heya,
something really cool happened to me the day before yesterday.

I came across a random book in public, which I thought was kind of weird. It was Jane Austen's novel "Emma". I picked it up because, honestly, I decided I want to read Jane Austen because she is considered one of the classics usually and I have never read anything by her (not even Pride & Prejudice!).
I opened it up, and on the first page there was a sticker that said something to the effect of "This book is not lost or discarded, it is on a journey! Read it and then put it out to be found once more."
Apparently there's a thing called
BOOKCROSSING which is kind of a mix between geocaching and take-one-leave-one libraries. You register a book at bookcrossing dot com, it gets assigned an ID, you put some information on/in it that explains the game, and then leave it in public somewhere. And when people find it, they are encouraged to register their find online using the ID (which notifies you) and leave a comment, then read it and send it on its merry way somewhere else. That way the book travels the world.
I thought this was super cool and a nice hobby to have. You can even go on little deliberate hunts for books; on the website it says roughly where there are still "wild" books to be found, and you can follow the steps to see where it leads you. It ought to be a really cool feeling to leave a book somewhere and get a mail a few weeks later that someone picked it up, read it and left a comment on it! You kind of made someone else's life a bit brighter.