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TO GO WITH AFP STORY (FILES) Boca Juniors' fans cheer for their team before the start of a match against River Plate for the Argentinian Closing Tournament, in La Bombonera stadium, Buenos Aires, 16 May 2004. 'Barrabravas' (violent fans) of Boca Juniors teach the 'ultras', or hard-core supporters, from Mexico, Colombia, Ecuador and to those of Spain's Real Madrid, to cheer up their players, but it is unclear if these are merely chanting lessons or a training to beat opponents. AFP PHOTO/Daniel GARCIA (Photo credit should read DANIEL GARCIA/AFP/Getty Images)