An old retired sailor puts on his old uniform and goes down to the docks once more for old times sake. He hires a prostitute and takes her up to a room. Hes going at it as best as he can for a guy his age. He asks, How am I doing? The prostitute replies, Well sailor, youre doing about three knots. Three knots? he replies, Whats that supposed to mean? She says, Youre knot hard, youre knot in, and youre knot getting your money back."