[Sparkologist]

Bob took his nymphomaniac wife to the doctor for treatment. "This Is one hot potato of a lady, Doctor," he said. "Maybe you can do something for her? She goes for any man, and I get very jealous."
"We'll see," the doctor said. He directed the missus into his examining room, closed the door behind him and told her to undress. Then he told her to get up onto the examining table on her stomach.
The moment he touched her buttocks, she began to moan and squirm. It was too much for him to resist, and he climbed up on top of her and began to screw her.
Bob heard moans and groans coming from the room. Unable to control himself, he pushed open the door, only to be confronted by the sight of the doctor astride his wife banging away.
"Doctor, what are you doing?" he asked.
The flustered doctor said, "Oh, it's you, Bob? I'm only taking your wife's temperature!"
Bob opened his switchblade knife and began to wipe it on his sleeve very deliberately. "Ok Doc,....." he said, "but when you take that thing out, it better have numbers on it!"