The sad thing is, this actually happened once. Kind of. A robber didn't ask for a bag of money, he asked the teller to deposit the money in his account. WHY does this cashier have a huge bag of money to hand him though? What, was it just under the counter or something? With a big dollar sign on it? You know, that would be a good prop for banks to just have ready, now that I think about it. Big heavy bags like that. With a knot tie at the neck, so they're very hard to open. And full of SOMETHING heavy. Then the robbers are satisfied when they're IMMEDIATELY handed such a bag. Though I think it would be funnier if he walked into a "Dollar Tree" store (where everything costs a dollar or less), pointed a gun at the cashier, and said "I want everything valuable, and no funny stuff".