Depends how you define a fight...
...I do volunteer psych tech work for a special division of the Haight Ashbury Free Clinic. My specialty is managing combative and abusive patients, especially when drugs are involved. You know all those stories about guys whacked on crack or PCP? I'm the guy that takes them down. It's quite different than the fighting scenario most peopel envision, because I'm not trying to hurt the patient, just contain him (or her, as the case maybe). I have had to deal with armed patients, but that's pretty rare. Usually, it's just trying to subdue someone out of control. I talk about it in my first Shaolin Trips article.