[Genetic Defect]

On the man's 75th birthday, he got a gift certificate from his wife. The certificate paid for a visit to a shaman 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 ticket to the shaman, and wondered what he was in for.

The old man slowly, methodically produced a potion. He handed it to the man, 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.'

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

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

His wife took one look at him. She was so excited she began throwing off her clothes. She jumped onto the bed and excitedly asked, 'What was the '1-2-3' for?'

And that, boys and girls, is why we should never end our sentences with a preposition.