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Revellers bang each other on the heads with a 'martelinho', a musical toy hammer, during the Festa de Sao Joao, in Porto, Portugal, 2013. Porto's Saint John party starts early in the afternoon of June 23 and lasts until the morning of June 24. The traditional attractions of the night include street concerts, popular dancing parties, jumping over flames, eating barbecued sardines and meat, drinking wine and releasing illuminated flame-propelled balloons. © Paulo Duarte