The Hadaka Matsuri ("Naked Festival") offers good fortune to a few lucky guys. It is an annual tradition, drawing thousands of men who wear as little as possible. The most famous place to celebrate the event is Saidaiji Temple in Okayama. Here is a short video from the BBC.
Additional source: https://en.wikipedia.org/wiki/Hadaka_Matsuri
"Naked" festival ... not that I'm complaining. A lot of weird stuff goes on over there in the land of the rising sun.