On his first day as a travelling salesman, he knocked on the door of his first house. As soon as the lady opened it he flung a massive pile of horse manure across the carpet.

“What on earth are you doing?” she shrieked.

“Madam,” he replied. “I have the world’s best and most powerful vacuum cleaner. I guarantee it’ll vacuum up all that horse manure and make your carpet look brand new. Or I’ll lick it up myself.”

“Would you like a napkin?” she asked.

“Why?” he asked.

“Because we have a power outage right now.”