An ATM error in Ekaterinbug city in Russia's Ural region allegedly led to a customer who deposited around $74 being credited with around $700,000,000 , not once but twice. The man 'fessed up to the bank clerks who initially said they were too busy to deal with it, until the man turned up with shoe boxes full of cash. The ATMs were soon switched off. [This story has the feel of an urban myth. The ATM receipt shown in the newspaper article could easily be a fake - they are available to purchase from online sources for joke purposes, although I haven't yet seen the Cyrillic option].
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