La Tomatina (Valencian pronunciation: [la tomaˈtina]) is a festival that is held in the Valencian town of Buñol, a town located 30 km inland from the Mediterranean Sea in which participants throw tomatoes and get involved in this tomato fight purely for fun. It is held on the last Wednesday of August, during the week of festivities of Buñol.
In 1945, during a parade of gigantes y cabezudos, young men wanted to be in the event staged a brawl in town's main square, the Plaza del Pueblo. Since there was a vegetable stand nearby, they picked up tomatoes and used them as weapons. The police had to intervene to break up the fight, and forced those responsible to pay the damages incurred.
(... from Wikipedia on 2012-04-18 01:22:13)