Reading Shokhead's post made me think of something that happened to me on Monday...

I was taking a customer out for lunch. The bill was about $49. When the waitress brought me the credit card receipt to sign, it was for only $36. My customer said, "cool, you save $13!". But I know that this $13 would end up coming out the waitress's pocket, so I called her over and showed her the mistake so that she could correct it. She was very grateful and must have thanked me a half dozen times.

So, be honest, what would you have done? Would you have taken the customer's attitudes of, "it's her mistake take advantage of it". Or would you have showed her the error so that she could fix it?