Imagine this. You're out for lunch with your friend and you find yourself short on cash (again) and she covers you. You stop at the first bank machine to pay her back and she attempts to debate the debt, but you force the $20 on her and flee. Your friend decides to take revenge and purchases you a great knitting book as a bonus Christmas gift.
The flaw in her plan, though, is that as a knitter you can continue the viscious cycle with a knitted gift in return. But then, this makes you think, was it her revenge or a devious plan?