A new vacuum cleaner salesman knocked on the door of the first house of the street. A tall lady answered the door.

Before she could speak, the salesman barged into the living room and opened a big plastic bag and poured all the cow droppings onto the carpet.

"Madam, if I could not clean this up with the use of this powerful vacuum cleaner, I will EAT all this s ....!" exclaimed the salesman.

"Do you need chilli sauce or ketchup with that?" asked the lady.

The bewildered salesman asked, "Why, madam?"

"There's no electricity in the house." said the lady.