Banta selling Parashut: Jump from the Plane; press the button; and you will safely land; Santa: If Parachute doesnt open? Banta: Dont worry; take your money back!
Sometimes Negative thinking is as important as Creative thinking because If Creative thinking invents Aeroplane then Negative thinking invents Parachute.
Jack selling parachute. You Can Jump from plane and press button and you can land safely. Customer Jill: If parachute does not open? Jack: I will give the money back!