I watched an episode of HIMYM yesterday, and someone got robbed. It made me thinking.
What if you once walked trought a park or something, and someone pointed a gun at you and told you to give him your money. In that situation you probably should do it, but why give them them your actual wallet?
They probably run away as soon as you give them your wallet, so what if you kept a cheap empty wallet in your jacket, and if you get mugged, you hand them that wallet.
Could maybe work.. ?
Someone has for sure already thought of this, but it can be an idea to keep in mind.