I went to Arby's for lunch today. An excerpt from the ordering process:

Cashier: "Um, I screwed up." *Places this on counter next to register, and looks like she's waiting for a response.*
Me: *wonders what she expects me to do about it*
Cashier: "What's 83 minus 53?" Me: "Um, 30." *more confused I look at object on counter*
Cashier: *shows me receipt. I'm still wondering what I'm supposed to do about it. Long pause of her sorta staring off into the distance.* "Yea, that makes sense." *reaches over to credit card machine to run the rest.*

So yes, I now have two receipts for my meal. The credit card company probably loves it, I wonder what the manager will say...