I always carried a baby Browning .25 for one reason. It was very concealable, even in my back pocket. I know people laugh about such a small gun, but up close and personal it will do the job, and that is where real trouble occurs. I agree with Quiet Eyes that having a good attitude and being polite and friendly can avoid most all problems, but if you are somehow perceived as a mark all that is out the window. Chances are one in a thousand he will find any trouble if he is careful where he goes and is attentive to who's around him. But for me, one in a thousand, especially if my wife is with me, is enough to know that I have some defense if necessary. In the end being alert and aware of who is around you is the best defense. I grew radar as a young man and it never left me. I constantly spot bad guys in malls and other places that 99% of the people ignore. They're there, they're watching, looking for an opening (women's purse, cell phone etc.) to grab something and run. Sometimes they see me looking right at them and they avoid me. I like it that way.