It is just a warning sign that you should be careful - I have picked up many a $20 bill off the street by being aware - both literately and metaphorically.<p>On this topic I found a wallet once with over $1000 in cash in it which I gave back to the owner. He could not believe that I would do such a thing, but the personal value it gave me doing this was worth much more than any monetary value I could have got from spending the money. Maybe I am an idiot :)