I was once 'mugged' by someone I knew. I put it in quotes because I knew the guy, and he was trying to get my car keys from me to take my car. I also knew he was on cocaine. I was about 18, he was 27, and in very good physical shape, much bigger than I was. However, I was wearing pointy heels, and evidently kicked him hard enough in the junk that he was bleeding... at least, that's what the police said later. I called them after I drove off to report the incident.