Grammar Lesson

On his 63rd birthday, Tom got a gift certificate from his wife. The certificate paid for a visit to a shaman living nearby who was rumored to have a wonderful cure for erectile dysfunction.
 
After being persuaded, he drove to the shaman, handed his ticket to the shaman, and wondered what he was in for. The old man slowly, methodically produced a potion, handed it to Tom, and with a grip on his shoulder, warned, "This is powerful medicine and it must be respected. You take only a teaspoonful and then say '1-2-3.' When you do that, you will be longer and harder than you have ever been in your life and you can perform as long as you want."

Tom was encouraged. As he walked away, Tom turned and asked, "How do I stop the medicine from working?"
 
"Your partner must say '1-2-3-4,' the shaman responded."But when she does, the medicine will not work again until the next full moon."

Tom was eager to see if it worked. He went home, showered, shaved, took a spoonful of the medicine, and then invited Jaynene to join him in the bedroom. When she came in, he took off his clothes and said, "1-2-3!" Immediately, Tom was the manliest of men.

Jaynene was excited and began throwing off her clothes. And then she asked, "What was the 1-2-3 for?"
 
And that, boys and girls, is why we should never end our sentences with a preposition.