Pigeon drop

The pigeon drop or Spanish handkerchief or Chilean handkerchief is a confidence trick in which a mark, or "pigeon", is persuaded to give up a sum of money in order to secure the rights to a larger sum of money, or more valuable object. One of the con artists will typically claim to have found the money or valuable on the ground just before talking to the mark, or will even leave it on the ground and pretend to happen upon it at the same time as the mark, hence the term "drop."