An old retired sailor puts on his old uniform

and heads for the docks once more for old

times sake. He engages a prostitute and takes

her up to a room.

He's soon going at it as well as he can for a

guy his age, but needing some reassurance,

he asks, "How am I doing?"

The prostitute replies, "Well old sailor, you're

doing about three knots."

"Three knots?" he asks, "What's that

supposed to mean?"

She says, "You're knot hard, you're knot in,

and you're knot getting your money back!"