In 2008, Dmitry Agarkov scanned in a credit card agreement he had received with much higher interest rates than advertised and changed all the terms to show 0% interest and no fees. The bank unknowingly signed and approved it and a judge later upheld the contract. – WTF fun facts
Source: https://www.themoscowtimes.com/2013/08/14/man-who-outwitted-bank-ends-700k-lawsuit-a26770