Something similar has happened to me. Many times some polite strangers to please me give me the change from a transaction, and instead of euros they give me leva (Bulgaria's currency)! I don't know how collectible it is, but unfortunately I don't understand it right away to thank them. You know the coin of one and two leva is almost the same as the corresponding one and two euros! Aaah in these hard times, there are some angels among us!
Lol, is this satire?
Unfortunately is a true story, very common in north Greece