I (Malice on Zoklet) have offered to fight numerous people if they're ever in the SF bay area, with the event recorded and posted online. No other people interfering, weapons, eye gouging, fish hooking, or anything else that could cause permanent/serious damage or death; for example, no breaking bones, give them a chance to tap out. Be aware of what you're doing, your surroundings/environment, and what it could do to someone.
A gentleman's spar, no hard feelings afterward. I'd only want to do this with people who feel genuine dislike and animosity.