Henry was getting along in years and he was slowly becoming unable to perform sexually. Finally he went to his doctor who tried a few things, but nothing seemed to work. The doctor referred him to an American Indian Medicine man.

The medicine man told Henry, "Of course, I can cure this."
That said, he threw a white powder in a flame, and there was a flash with billowing blue smoke.

Then he proclaimed, "This is powerful medicine. You can only use it once
a year. You have to say '123,' and it shall rise for as long as you wish!"

Henry, unsure of something asked, "What happens when it's over, and I don't want to continue?"

"You or your partner must say '1234', and it will go down. But be warned it will not work again for another year."

Henry rushed home, eager to try out his new powers and prowess.

That night Henry was ready to surprise his wife, Joyce. He showered, shaved, and puts on his most exotic shaving lotion. He got into bed, and lying next to Joyce says, "123." He suddenly became more aroused than anytime in his life -just as the medicine man had promised.

Joyce, who had been facing away, turned over and asked, "What did you say 123 for?"

And now you know why you shouldn't end a sentence with a preposition.