Real errors. Real money. Really just cells. Every exhibit below actually happened — a misplaced minus sign, a copy-paste, a file that quietly stopped at row 65,536.
Admission is free. The exits are too — see the gift shop at the end.
Curated with sources. No urban legends, no "a friend at a bank" — each one made the papers, the filings, or a Senate report.
A portfolio ballooned into a monster trade while risk reports said everything was fine — because a manually operated spreadsheet was doing the math wrong after a copy-paste.
Source: US Senate Permanent Subcommittee on Investigations (2013); JPMorgan task-force report.
Positive test results fed into a file in the legacy XLS format — which silently stops at 65,536 rows. Nearly 16,000 infections never reached contact tracers during a surge; tens of thousands of contacts were warned days late.
Source: BBC / Guardian reporting, October 2020.
The famous claim that growth collapses past 90% debt-to-GDP was cited by finance ministers on two continents to justify austerity. A grad student replicating it in 2013 found the Excel had omitted years of data — the "collapse" largely an averaging artifact. The authors conceded the coding error.
Source: Herndon, Ash & Pollin (2013), UMass Amherst.
Bids for transmission contracts were assembled in a spreadsheet. Rows got shifted during a cut-and-paste — so the company attached its bids to the wrong contracts, and overpaid by $24M for capacity it didn't want.
Source: TransAlta disclosures; Globe and Mail.
An accountant omitted a single minus sign, converting a $1.3 billion loss into a paper gain — and quietly inflating the fund's reported returns until the audit caught it. One character. Twelve zeros of meaning.
Source: contemporaneous press, 1995.
When Barclays bought Lehman's assets, contracts to be excluded were listed in a spreadsheet — some in rows that were hidden. The team rebuilding the list didn't see them, and Barclays accidentally purchased 179 unwanted contracts it then spent years untangling in court.
Source: court filings; The American Lawyer.
The exhibits are spectacular. Yours is quieter: the hour your team loses every week untangling the sheet — plus the error you haven't found yet.
Back-of-envelope estimate: people × hours × rate × 52. Doesn't count the errors — and field audits say there's an 88% chance there's at least one in there.
Field audits of real operational spreadsheets (Prof. Ray Panko, University of Hawaii) find errors in roughly 88% of them, with about 1 in 100 formula cells wrong. That's not carelessness — it's what happens when people hand-build software with no compiler, no tests, and no review.
Among publicly documented cases, JPMorgan's 2012 "London Whale" — about $6.2 billion, traced in part to a copy-paste formula error in a manually operated risk spreadsheet.
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