The world famous San Fermin festival in Pamplona, Spain has kicked off again. The festival is best known for itís daily running of the bulls through the narrow streets. Thousands of revellers take part in this ritual, often still hung over from the party the night before. It all makes for a great cultural event, but there is a serious, more traditional side to the San Fermin festival. Each day matadors climb into the arena to fight (and kill) the bulls, but most revellers forget about that part and simply gear up for another night of drinking and a new morning of running. Revellers hold up red scarves during the start of the San Fermin Festival in Pamplona July 6, 2011. The festival, best known for its daily running of the bulls, kicked off on Tuesday with the traditional Chupinazo rocket launch and will run until July 14. Runners sprint in front of Torrestrella fighting bulls at the entrance to the bullring during the first running of the bulls of the San Fermin festival in Pamplona July 7, 2011. Four people suffered minor injuries in the run that lasted two and a half minutes, according to local news sources.