Jack the Whistler

He’s called Jack the Whistler because by putting two fingers
in his mouth his whistle can be heard over a mile away. One
evening, Jack takes his girlfriend down lovers’ lane and by
the time they’re ready to go home it’s very late and they catch
sight of the last bus disappearing round the corner.
“Quick, Jack, whistle,” urges the girlfriend. Jack starts to put
his fingers to his mouth but suddenly stops.
“No, I’ve a better idea,” he says. “I feel like a bit of exercise
tonight, let’s walk.”