One day, at the door of an old woman knocks a gentleman, elegantly dressed, with a vacuum cleaner in his hand. As soon as the old woman opens the door, the guy starts:
-I'd like to present you the most advanced vacuum cleaner...
As he spoke, he threw on the hallway carpet a considerable amount of manure, explaining:
-Don’t worry, if this vacuum cleaner does not clean EVERYTHING on the carpet in 10 minutes, I promise to eat what remains!
After listening the whole story, trembling with nerves, the old woman responds:
-I hope you have an appetite, I have no electricity since this morning!