That's not always good advice Tony. I once had an ATM machine give me $20 too much money. I called the bank the next day and tried to give it back. They kept getting confused and thought I was filing a claim for getting shorted and I had to eventually talk to a higher level manager in customer service to convince them that I was actually reporting that it gave me too much. They assured me that if the ATM came up $20 short that they'd go get it from my account.
A month later, I noticed on my statement that they'd put another $20 in my account
Grocery store checkers always seem surprised when I tell them they gave me too much change!
