I knew Glenn Danzig was a black belt in something or other but had no solid idea of what his training was in.

I guess he studied Jeet Kune Do, at least in part (don’t know if he’s ranked in that… Google isn’t turning up any real solid information on his martial arts background):

Then of course, there’s the whole North Side Kings incident. I think Danzig brought that on himself (at least, based upon what you see in the video). Goes to show that no matter how badass you are (or think you are), if you’re an asshole sooner or later you’re going to get your ass beat. 🙂