"Um. No, I think that's wrong. I had planned on giving you $60, and getting $5 back."
"Oh. Did you have gas?" [Seriously, she was asking ME, a customer with a possible motive to lie and save $40, rather than Young'un, her own employee?]
"Yes. $40 on Pump 3. And here are the tickets."
I started grouping like tickets together, to show how they added up. Then she got all snippy with me!
"CAN I JUST!"