What would you do?

[Beckpatton]

I would have gone back and paid for it, I don't like to mess with my money karma!

[RedRoseSpiral]

I've worked in fast food and I and my coworkers always hated being interrupted when there was a mix up and the customer got something extra and tried to give it back. We have enough to worry about than someone getting an extra fry and we can't take the food back anyway. That's why I don't worry about it if it happens to me. It's a nice little bonus in life.