OKAYAMA, JAPAN - FEBRUARY 21:  Elementary school boys join the kids version of the event at the Hadaka Matsuri, or Naked Festival at Saidaiji Temple on February 21, 2015 in Okayama, Japan. Some 9,000 men battle to grab a pair of lucky sticks thrown by priests in this one of the most vibrant festivals in Japan.  (Photo by Trevor Williams/Getty Images)