Harry is getting along in years and finds that he is unable to perform. He finally goes to his doctor, who tries a few things, but nothing works.
Eventually a friend refers him to an old gypsy woman.The gypsy says, "I can cure this." That said, she throws a white powder in a flame, and there is a flash and billowing blue smoke. She collects the ash and says, 'This is powerful medicine. You can only use it once a year. All you have to do is say '123', and it shall rise for as long as you wish!" Harry then asks, "What happens when it's over, and I don't want to continue?" The gypsy replies: "All you or your partner has to say is 1234,and down it will go. But be warned - it will not work again for another year!"
Harry rushes home, eager to try out his new powers and prowess. That night he is ready to surprise Joyce. He showers, shaves, and puts on his most exotic aftershave. He gets into bed, and lying next to her whispers, "123."
He suddenly becomes more aroused than anytime in his life, just as the gypsy woman promised.
Joyce, who had been facing away, turns over and asks, "What did you say 123 for?"And that, my friends, is why you should never end a sentence with a preposition.