Yesterday, @cstross mentioned the old "Whoops, Apocalypse!" telly series, and I said "Excel, Apocalypse!".
The #ExcelApocalypse hashtag is now here, for the U.S. government that conducts military operations from unsecured personal 'phones in Moscow, that puts a MAX() function on a spreadsheet that erroneously impacts a load of countries, and that forgets to send out the formal order backing off from its tariff war to the blanket 10%.