Norman, an old retired sailor, puts on his old uniform and heads for the docks once more for old-time’s sake. He engages a woman of the night and takes her up to her 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 lady smoothly replies,
‘Well Norman, you 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.’