Check your $100 bill
 

Someone has been altering $5 bills, hold bill up to the sun and check watermark, friend of mine went to his bank a few days before he returned 2 days later.. On first visit he wanted to make some change of his $100 bills. He returned a few days later to make a deposit, bank teller caught it and asked him where he had gotten his $100 bill, he said i got it here 2 days ago. She showed him the watermark and lincoln face showed up. He thought he was going to lose it, but the bank made good.