If a friend asks me to add a few hours to work time sheet for him and I know he didn't put in the time, I'd give a whole lecture and make him do it. If the salesperson offers an Ipod at a discounted price after hours, I'D TAKE THE DEAL. But.. I'd ask why first. If the teller at the bank gave me too much more money in a banking transaction.. If it's just an extra 20, I'd keep it, if it's like 50 or more, I'd give it back, aha.