Three ex-marines are in a London pub when a flashily dressed man enters holding a large roll of notes. Seeing the marines and recognising their previous trade he says "For going in harms way, I'd like to pay you one pound for every inch I can measure between parts of your body"
The first marine says to measure his chest, 50 inches and he is handed his money.
The second says top of his head to his feet, 72 inches, and he is handed his money.
The third says from the tip of my penis to my testicles. Rather confused the man agrees and trousers are lowered.