Yesterday went to a scenic spot to buy tickets, 31 tickets, gave me 100 and asked me to give him 50, so I listened, came back and looked at it, the 50 was missing a corner and couldn't be spent, because before I took out the money, this was my only 100, so this 50 missing a corner must have been given to me on purpose, for those of us who are used to electronic payment at home, we still need to check if the money is missing a corner ?
Turkey Q&A