From u/BravoNZ Tales From Retail:

Just relaying a story from a girl who is currently working as a cashier in a gourmet food shop as her first job, she is a very good friend of my daughter and she was telling all of us this story earlier today.

Lady customer (L) walks in store with a receipt in hand only and beelines for this cashier girl (G).

L: I need a refund. G: Ok, what item you want to return?

L: The doughnut, this one here (points to the receipt line with the culprit doughnut listed)

G: No problem, what is wrong with it, can you please show it to me?

L: Can't, I ate it, but it made me feel fat because it was very filling and I want a refund.

G: Uh... (signing to the floor manager).

She didn't get a refund.

What is really frightening is this girl is saying this is not the weirdest one and she has customers like this almost every day. She kind of lost her trust in the human race.

--u/BravoNZ