People, most of them dressed with Halloween costumes, take part in the flash mob "Halloween bike ride" before touring around the city in Madrid, Tuesday, Oct. 31, 2012. (AP Photo/Daniel Ochoa de Olza)

Associated Press
People, most of them dressed with Halloween costumes, take part in the flash mob "Halloween bike ride"  before touring around the city in Madrid, Tuesday, Oct. 31, 2012.  (AP Photo/Daniel Ochoa de Olza)
People, most of them dressed with Halloween costumes, take part in the flash mob "Halloween bike ride" before touring around the city in Madrid, Tuesday, Oct. 31, 2012. (AP Photo/Daniel Ochoa de Olza)
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