Happened to me once. Around $85,000 mysteriously showed up in my checking account. I went to the ATM to see if in fact it was also credited there and not just an online misprint. It was available at the ATM too. I had no intention of spending a dime of it, but just for kicks, I kept quiet about it — wanted to see how long it would take my bank to notice the error. A week or so later, the money was still there, so I walked into the bank and said, “I think there has been a mistake. . . “ Turned out that another customer’s money had been accidentally credited to my account. It was nice dreaming for that week!
I’d want to make friends with the guy that can keep $85K in his “checking” account !!!