Anniversary

On their 40th anniversary, a woman gives her husband a voucher to visit a witch doctor about his erectile dysfunction.

The man asks the doctor what to do about his problem-he just had trouble standing at attention, now that he's over the hill. The witch doctor gives him a medicine and says, "When you're ready to have sex, drink this potion and say, 'one, two, three' to have an erection. When you're finished, say, 'one, two, three, four' to reverse the effects. This only works once, so use it wisely."

The man takes his wife to a show and a lovely anniversary dinner, then back home where they get ready for their night of passion. He walks into the bedroom, undresses for her, drinks the potion, and says, 'one, two, three'. In a matter of seconds he's the most well-endowed he's ever been.

His wife says, "Wow, what a transformation! But what was the 'one, two, three' for?"

That's why you never end your sentence with a preposition, because you'll end up with a dangling participle.