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I once saw a $1b payment error for postage... Each day the supplier's software mistakenly billed the month-to-date total instead of the new day's work. That MTD

I once saw a $1b payment error for postage... Each day the supplier's software mistakenly billed the month-to-date total instead of the new day's work. That MTD amount therefore doubled each day. And since they were a trusted supplier, it was automatically paid... The error was only discovered a week later, when the business's main bank account went $1b overdrawn.

stevesimmons 9y ago
Of course, the software bug was found pretty quickly and the release rolled back. The funniest part of this story is the next monthly software release accidentally reinstalled the old buggy code, not the new release. So the incorrect payments happened again!