9,000 half-naked men gallivanting in loincloths? Ah, that'll be the Hadaka Matsuri Festival. This naked fest is an eccentric 500-year-old Japanese tradition, with thousands of de-robed men grappling to be the proud owner of some 'shingi', or 'lucky sticks'. Thrust the sticks upright (oo-er!) and you'll be blessed with a year of non-stop happiness. Pass us a loincloth then.