Northern Powergrid sorry for Storm Arwen trillion pound compensation error

Previously, a man in Malysia mistakenly received a telephone bill for 84 ringitt (£125 trillion [1], or $218 trillion [2]).

Also, in 2003 a man received a final demand letter for £2,320,333,681,613 from British gas [3].

[1]: https://www.theguardian.com/world/2006/apr/11/malaysia

[2]: https://www.nbcnews.com/id/wbna12247590

[3]: https://catless.ncl.ac.uk/Risks/22/61#subj2.1

Two amazing things here: The computer program that converts the amount to English knew how to deal with two trillion, and the same computer program had no cut off to say "if the cheque we're sending out is over a few thousand, maybe it needs to go through a workflow involving personal sign-off by the CFO".