Japan has a lot of oddly gendered holidays, but one of the most intense is Hadaka Matsuri. This is actually more like a festival than a holiday, as different regions host them at different times of the year, but they all have one thing in common: nearly naked men wrestling over sticks in huge numbers. How it works is this: Dudes go outside in the blistering winter cold, wearing only the traditional fundoshi loincloth (like sumo wrestlers wear) and then a Shinto priest tosses a sacred pole out of a temple window. If you can grab it and put it into a box full of rice, you get 100 years of good luck. But you’ll have to deal with the hundreds of other dudes trying to do it, as well. It’s a sweaty, fleshy apocalypse that is truly bizarre.