From YahooNews:

Man Is Charged $4,300 for Four Burgers

PALMDALE, Calif. - Four burgers at his neighborhood Burger King cost George Beane a whopping $4,334.33.

Beane ordered two Whopper Jr.s and two Rodeo cheeseburgers when he pulled up to the drive-through window last Tuesday. The cashier, however, forgot that she’d entered the $4.33 charge on his debit card and punched in the numbers again without erasing the original ones — thus creating a four-figure bill.

(more here)

Ok I see this happen to me from time to time,  where a clerk enters a wrong amount,  when they happens they just re-do it, and wipe out the charge, I don’t understand why they couldn’t do that in this case.