You know what's even worse? Cashier's that correct your grammar. GOD Shannon I KNOW the apostrophe doesn't go there. Lay OFF, woman.
You might have missed it because of that distracting rectangle, but the receipt is filled with delightful examples of a cashier whose power has gone to his head. His Holiness indeed.
In a word's transition from verb to noun, there are often casualties.
If his headphones are in while you're serving him, then it's both.