If you are a cashier, then at some point some one has asked you to change a bill. Always be careful when listening to the request. For example, this guy came up to me and asked me to change a $50 Bill. I give him 2 $20 dollar bills and a $10 bill. He then asks me to change the ten for two fives. This is where they will try to get you, by asking for more change. Be diligent from this point on. So I am looking but we are low on fives and I state this to him and his reply was, well you can give me two tens. Ok stop. Why would I give you two tens if you gave me one ten dollar bill? If a cashier is being rushed or is trying to hurry, this may cause them to not pay attention and then be short because they gave too must change back. I smiled and said, I’m just gonna give you ten singles. Watch out for these types. Ask them before hand what change they want and if they start asking for more, just end it right there. You do not work for a bank. You work in retail.