A man with a piece of paper in his hand comes into an office where another man is sitting next to a shredding machine.
“Do you know how to operate this thing?” he asks. “I have an important paper here and I want to make sure this is done right.”
“Sure,” the other man answers. “Just put the paper in here and press this button.”
The first man does so, saying: “Great. And where do the copies come out?”