Gather all requirements before committing to the client

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

A tall lady open the door.

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

"Madam, if I could not clean this up with the use of this new powerful Vacuum cleaner in the next 10 mins, I will EAT all this dung!"

Exclaimed the eager salesman.

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

The bewildered salesman asked, "Why, madam?? "

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

Moral of the story:
Gather all requirements and resources before working on any project and committing to the client...!!!