Tonight I observed for the second time in a new variety a simple way to scam people of their money. You use a 50 point bill to attract people in hopes of winning it by gambiling. You scramble three covers of some sort over a single ball and you do it quickly. The rig comes with having the player step on one of the covers before they choose which they think the ball is under. Somehow this eliminates the ball under that cover and produces a different ball under the other (it must happen this way, or some version of that). The allure comes with possibly winning the 50 point bill with your bet of a 5, 10, or 20. Sometimes you pick the cover with the ball under and take the 50 point bill. But the guy doesn't care who wins and who loses, as long as more people lose their smaller point bills (which he pockets) during more games in which those losses add greater than 50 than a winner takes one of the 50 point bills. He can even produce new 50 point bills when somebody wins as long as he rigs the game enough times to make up for it, with successive losses for the betters losing smaller point bills. Saw it first with soccer balls in Paris and second here in Barcelona with marbles.