One of the great lines, but for those who haven't seen the movie you have to provide the context.
It's John Wayne, as Jacob McCandles in Big Jake (1971), speaking to the kidnapper of his grandson, Richard Boone. He's just delivered the ransom (and been told for about the 10th time in the movie "I thought you were dead") and he's shown the kidnapper that the "money box" contains cut up newspaper.
And Wayne said it in a whisper. With a smile on his face. About as cold as I've ever seen a threat delivered.
Great line.
A great movie - even my kids love that one when it is on.
They love it when the boy says, "Are you my grandfather?"