Apparently, it doesn't take much to start a soccer riot in Peru; all you have to do is trap a soccer ball with your ass.
In Peru, Efrain Viafara, a midfielder for Sport Ancash, created an uproar when he used his buttocks to trap the ball. His bit of unorthodox skill was interpreted as a mocking act by Universitario players, who chased Viafara. Fans began to fight in the stands, then poured onto the field before the referee abandoned the game.
Are Peruvians so easily offended? They legitimately riot after seeing this trick, to the point that they cancel the game? Heavens, we can't imagine how they'd react to that guy who scored with his penis a few weeks back. We don't particularly want to try.
Soccer Notes [New York Times] (last item)