> The closest real-world analogy I can think of is this: you want to by a DVD but cashier is ignoring you. So, you slap a $20 bill on the counter and walk out w

> The closest real-world analogy I can think of is this: you want to by a DVD but cashier is ignoring you. So, you slap a $20 bill on the counter and walk out with the DVD Wrong. In your scenario, the DVD in question is for sale, and is clearly listed as such with a price and all. You know exactly how much it costs, and you give that much money. And the transaction occurs in a place that is designed for this very purpose. There is no confusion or grey area here.