I think I'd perfume the opposite of my intentions. I loathe street fights as you never really know the capacities of your opponent and can get badly hurt. That in mind, the key is always to end things fast.
If I could foreshadow the events of the evening, I'd confuse my opponent by wearing something gentlemanly like Heritage or VCA, get in kind of an old-fashoined high-fisted stance, and as soon as it all went off I'd grab him by the nuts and not let go.
It's certainly a dirty way to go but is a never-fail way to put an end to such silliness.