I used to carry a comb when I had hair. Hold the comb so that the tines face forward. The bog tines at the ends stick out about 1" above and below the clenched fist. You can guess the rest with no help from me.

Basically, I try to stay away from 'trouble' places. When I am in that kind of area, I walk like I have a purpose and carry myself in such a way that I look as though you don't want to mess with me. I learned to walk like that when I lived in NYC. I learned about the comb where I grew up in Montreal.