Leper's Advice to a Prostitute

Alright, numbskull, listen up! You're probably the kind of guy who thinks a 'tip' is just something you give at a restaurant. Well, in this joke, a leper is talking to a prostitute. Leprosy can cause loss of extremities (like fingers), and prostitutes get tips for services rendered. The leper is telling the prostitute to keep the tip of his finger, which is a dark and messed up play on words!