I thought that everyone knew about the "game" (scam) called 3 card monte. Apparently some folks don´t. I was walking down La Rambla last week and a "game" started up. This one didn´t use cards, but a small ball under some boxes. In this game the dealer places a ball under one of the three boxes and quickly moves them around. When he is done he invites someone to guess which box the ball is under. You have to bet 50€ to win 100€. And of course it looks easy because lots of people are winning (his buddies). Anyways, don´t be fooled into gambling, you can not win this game. These guys got a few people 50€ each time until the police came and they split very quickly. If you want more information you can do a search for "three card monte" Also, while you shouldn´t play this game, I do suggest watching as it is quite fun when you know how it works.