I Have 20/20-Dollar Vision

(My father has been blind since he was a toddler. Before he retires he runs a small snack bar in our local city hall. Since it is not uncommon for people to lie to him about the denominations of bills he is given, he has a “verifier” machine he can run money through that tells him the amount of the currency. After I graduate, I spend my summer working for him. My father is on break, and a man approaches me with several items. He hands me a dollar bill.)

Customer: “That’s a twenty.”

Me: “No… This is a dollar.”

Customer: *becoming upset* “Well, I didn’t know you could see!” *storms out, leaving his items behind*

Me: *dumbfounded*