I felt like an afternoon pick me up, and the nearest place to my work is one of those gas stations that sells all kinds of coffee; lattes, frozen, iced, etc. All the prices are posted on large signs over each of the "stations."
I make myself an iced coffee, and bring it to the front.
The guy at the register rings it up and says, "$1.56."
I tell him, "No, a medium iced coffee is 99 cents."
He gets all snarky and tells me, "No, it's a little more expensive than that."
I tell him that the sign says 99 cents, and he again snarkily tells me it doesn't.
The signs are huge, so I march over and point to where it says, "Iced coffee, 99 cents" and point to it.
He then just gives a big sigh, voids the transaction (making exaggerated motions the whole time and acting like I had demanded his first born) and gave me my correct total without an apology, or even an "oops."
I guess I was supposed to apologize for expecting to pay the posted price?