From  ShadyShadyShades, Tales From Your Server:

Customer orders 2

“2 what?”

2 guinness

“Pints or middies”

Pints

“So that’s 2 pints of Guinness?”

Yes

As I’m letting the the Guinness settle before finishing the second pour the customer notices signs for a lager on special.

I ordered Swan

“No you ordered Guinness, I repeated the order back to you and you said yes”

What can we do?

“You can pay for what you ordered”

Which he did

-- ShadyShadyShades