Short By One Dollar, And A Lot More Brain Cells

(A girl has ordered a shake which costs $3.13. She gives me a five-dollar bill.)

Me: *to myself* “Okay, that’s $1.87.”

(I smile and hand the girl her change. She takes the money and counts it, and then she looks at me and says, rudely, I might add:)

Customer: “You need to give me another dollar.”

Me: “Umm… No, I gave you the correct amount.”

Customer: “No, you didn’t. I gave you a $5 bill. So you need to give me another dollar.” 

(One of my coworkers comes by and asks what’s happening.)

Me: “She paid with a—”

Customer: “I gave her a $5 bill. And she forgot to give me another dollar.”

(My coworker looks on our screen to see how much she paid.)

Coworker: “That looks right… but just in case.”

(He then pulls out his phone and calculates it. It is correct. He flashes his phone to her.)

Customer: “Oh.”

(Then, she walked away. No apology. No thank-you. Nothing. I don’t know if she was trying to short me or was stupid, but either way, wow.)