Have you ever wrote on your country's currency or seen what people write on it? (yes, defacing or writing on currency is illegal) Im sure the most basic one is where's george. People either write on it or stamp that on there. I was going to make a deposit today at the bank and counted the money and saw that someone wrote "What you are eating is killing you. Eat Organic!" (like salmonella is not gonna kill you) Another one I saw was pass this along and you'll get good luck.