#20 A bathhouse
For the wrestlers of defunct Japanese death match promotions FMW and IWA, a regular hardcore match in an arena filled with screaming fans just wouldn't do. In order for people to truly appreciate the enormity of their confrontation, Tarzan Goto and Mr Gannosuke had to up the ante.
Back in August of 1995, they comically faced the Headhunters (who appeared the WWF Royal Rumble just a few months later) in a real-life Japanese bathhouse that was filled with members of the public who were just there to enjoy a skinny dip. The original video won't be linked here due to some unfortunate NSFW nudity from the unsuspecting bathhouse patrons, but here's a time-stamped synopsis by WhatCulture and you're welcome to search YouTube for the original video yourself.