Kensei wrote:
Learnt a trick a while back, when you carry money, put half of it in a side part of the wallet. So when the mugger ask for your money, just open it and give them what is in the main area. Else, if you think they are actually going to kill you, just throw the wallet at them and leg it - money can be regained, life cannot 
That's not gonna work, a mugger isn't going to let you give what you want, they'll just snatch your whole wallet as soon as you take it out, and then probably punch you in the face for trying to be clever.