The following news story is hilarious unless you are one of the two banks involved or the guy in the mugshot:
This very same thing happened to me…sorta. I was playing blackjack when the dealer accidentally overpaid me $10 on a double-down bet. I gambled it all away.
Blackjack Stories 
we should all be playing the ATMs now instead of the slot machines
The banks are just as crocked as the casinos. At least in a casino house, you have a chance to mnake money. With banks you are guyaranteed to get screwed.