I was thinking at the atm today while I was pulling some cash out - what if someone comes up behind you and says "give me all your money"? Nothing about having a weapon, but you dont know for sure wether or not he has one. What do you do? I wouldnt want to just turn around and shoot and have it turn out that the guy is unarmed. And if he is armed when you turn around he would already have the advantage of having the gun or knife drawn on you.