A woman rides a mechanical bull before participating in the 4th annual Running of The Bulls October 15, 2011 in Cave Creek, Arizona. (Photo by Joshua Lott/Getty Images)

Participants run during the 4th annual Running of The Bulls October 15, 2011 in Cave Creek, Arizona. Over 4,000 people are expected to run with twenty-one bulls along a quarter mile track during the three day event. (Photo by Joshua Lott/Getty Images)