You're in a currency Exchange holding Money in your hands and you're acutely aware of the fact that you're a female tourist, you're partially sighted and you're standing in a public place with a large amount of money.

The well dressed man with the expensive cologne comes over while you're still trying to put it in your bag. He's concerned about you. This area isn't safe, he says. He shows you his Briefcase with his own money. Put your money here with mine and I'll get you back to your hotel safely. You can carry it if it makes you feel better, he says.

You take him up on the kind offer. He is charming and makes conversation as you walk together. Until the robber with the knife emerges from an alley. Run, the man shouts at you as he struggles with the robber, and you do. You run all the way back to your hotel room. 

What you don't see is the men watching you run and laughing together as you disappear around the corner. They know that they switched the briefcase at the exchange for an identical one containing nothing but stacks of blank paper. They know that they now have their money and yours.

What they don't see is you taking off your glasses and tossing them on the dressing table with a smile. They don't see you open the briefcase and take out your money and theirs and lay it out on the bed. And they certainly didn't see that your sleight of hand was considerably better than theirs.