Why do people sign up for Pamplona's running of the bulls?

Runners from all over the world come to Pamplona to match their wits with half-tonne bulls in this iconic, and dangerous, festival.

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    Spain's week-long running of the bulls festival has kicked off in Pamplona.

    People are injured every year - sometimes even killed - as 500-kg bulls chase them through the cobbled streets.

    So why on earth would someone sign up for this?

     

    Al Jazeera's Karl Penhaul reports from Pamplona, Spain.


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