[Hammerhead]

An old fisherman puts on his lucky hat and heads for the docks looking for some action


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 ya ol'fart, 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,
- You're knot getting your money back!"