Vacuum Cleaner Salesman
"If I could take a couple of minutes of your time, I would like to demonstrate the very latest in high-powered vacuum cleaners.
"Go away!" said the old woman. "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."
In addition, with that, he emptied a bag of ashes and dirt onto her hallway carpet.
"If this vacuum cleaner does not remove all traces of the ashes and dirt from your carpet, Madam, I will personally eat the remainder."
The old woman stepped back and said, "Well I hope you've got a darned good appetite, because they cut off my electricity this morning.