I recently discovered this site in which you can registrate your eurobanknotes. I think it's fun to do, because if you have registrated a eurobill that has already been registrated by somebody else, you can see on a map how far your bill has travelled!
I have managed to get one hit, my 2013 5 eurobill has travelled 58 kilometres from Gouda to Veenendaal (Netherlands)
So yeah, I think it's fun to do, maybe you think the same!
http://en.eurobilltracker.com/home/
Greetings