On his 74th birthday, Stan received a gift certificate from his wife, Martha. The certificate paid for a visit to a medicine man living on a nearby reservation who was rumored to have a wonderful cure for erectile dysfunction.
After being persuaded, he drove to the reservation, handed his certificate to the medicine man, and wondered what he was in for.
The old man handed Stan a bottle of potion to him and warned, 'This is a powerful medicine. You take only a teaspoonful, and then say '1-2-3.' When you do, you will become more manly than you have ever been in your life, and you can perform as long as you want."
Stan was surprisingly encouraged. As he drove away, he asked, "How do I stop the medicine from working?"
"Your partner must say '1-2-3-4,' but when she does, the medicine will not work again until the next full moon."
Stan was very eager to see if it worked so he drove home, showered, shaved, took a spoonful of the medicine, and then invited Martha to join him in the bedroom.
When she entered, he immediately shed all his clothes and shouted, "1-2-3!" Instantly, he was the manliest of men.
Martha, too, became excited and began throwing off her clothes; then she asked,
"What was the '1-2-3' for?"
And that, boys and girls, is why you should NEVER, EVER end your sentences with a preposition. You could end up with a dangling participle!