One Atlanta-area janitor likely thought they hit it big after they were mistakenly sent over half a million dollars in overpayment by their employer, the Metropolitan Atlanta Rapid Transit Authority (MARTA).

MARTA asked them to give the $620,000 back. Five months later, they still haven't — so MARTA's taking them to court.

"I really never heard of [a payroll error] that had that much money involved in it," said Charles Bridgers, an attorney who specializes in employment law, to Atlanta News First.

$620,000 is a huge amount of money, no matter if you're a janitor or a government body. It makes sense that both parties would be prepared to fight over it in court.

But which party is most likely to win? And what should you do if your employer overpays you?

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