A little old lady answered a knock on the door one day, only to be confronted by a well-dressed young man carrying a vacuum cleaner.
"Good morning," said the young man. "If I could take a couple minutes of your time, I would like to demonstrate the very latest in high-powered vacuum cleaners."
"Get lost!" said the old lady. "I haven't got any money," and she proceeded to close the door.
Quick as a flash, the young man wedged his foot in the door and pushed it wide open. "Don't be too hasty!" he said. "Not until you have at least seen my demonstration."
And with that, he emptied a bucket of horse manure all over the hallway carpet. He continued, "And if this vacuum cleaner doesn't remove all traces of this horse manure from your carpet, Madam, I will personally eat what's left."
"Well," the old lady said, "I hope you've got a bloody good appetite, because the power got cut off this morning."