one day I bought something at a local store..
I gave the cashier a 20..
she gave me the change and I walked out the door
just before I got to my truck I saw that not only did she give me my change, she gave me my 20 back too
so back to the store I go, I wait till the cashier finishes with the next customer and say excuse me but you made a mistake when you gave me my change..
before I got all the words out of my mouth she said I don't make mistakes and you should of check your change when I gave it to you so you are S O L
so I said you are right I am sorry to both you..oh and thanks for the extra 20 you gave me...and walked out the door
so I think you should always try to do the right thing, and hope the cashier is a stupid as the one I had