Revellers celebrate during the Chupinazo, marking the first day of the San Fermin running-of-the-bulls on July 6, 2011 in Pamplona, Spain. Pamplona's famous Fiesta de San Fermin, which involves the running of the bulls through the historic heart of Pamplona for eight days starting July 7th, was made famous by the 1926 novel of U.S. writer Ernest Hemmingway called “The Sun Also Rises”. (Photo by Denis Doyle/Getty Images)

Revellers hold up traditional San Fermin scarves during the Chupinazo, marking the first day of the San Fermin running-of-the-bulls on July 6, 2011 in Pamplona, Spain. (Photo by Denis Doyle/Getty Images)

Revellers prevent police from entering the Plaza de Ayuntamiento (town hall square) during the Chupinazo, marking the first day of the San Fermin running-of-the-bulls on July 6, 2011 in Pamplona, Spain. (Photo by Denis Doyle/Getty Images)

A festival goer jumps from a fountain to be caught by the crowd during the Chupinazo, marking the beginning of the San Fermin festival on July 6, 2011 in Pamplona, Spain. (Photo by Denis Doyle/Getty Images)

A festival goer is stretchered away by an ambulance crew after he was injured jumping from a fountain during the Chupinazo, marking the beginning of the San Fermin festival on July 6, 2011 in Pamplona, Spain. (Photo by Denis Doyle/Getty Images)