Bank error (404) makes restaurant manager the world's first ever trillionaire

As an aside, I once woke up to find my shiny new checking account (opened the day before) had a balance of $10million. At first I was all kinds of tickled, but then I realized the number was red.

Turns out Chase couldn't verify my address (I'd just moved) and their method of getting me to come in was to put my account $10million in the red. Admittedly, it was quite effective. I came in the same day and closed my account.