Cold Customers To Calculating Staff

(Working on the till can sometimes get a bit boring and repetitive, especially when having to ask the same questions over and over again. To keep my brain busy, when a customer pays with cash I sometimes work out the change in my head before the till tells me what it is.)

Me: “Your change today will be [amount].”

(I enter the amount of money given into the till. Sure enough, I am correct with the change.)

Customer: “You knew it beforehand? How did you know?”

Me: “Um, mental arithmetic?”

Customer: “No, no! You work in a shop! You shouldn’t know math! Honestly, what next?!”