[leephillips]

Well, there is the classic W.C. Fields movie, "You Can't Cheat an Honest Man". It opens with a con where a cashier pretends to be distracted and acts like he is overcounting the change for a customer, who grabs the money and runs. But the ruse is to cover up the fact that the cashier actually short-changed the customer, who, if he had tried to protect the cashier from giving him too much change, would not have been cheated.