Funny because it's true. Every item on this list has ended a career, a quarter, or a quiet Tuesday. Sources linked where reality outperformed satire.
The "temporary" tracker from 2019 became the system of record because rewriting it is terrifying and it mostly works. That's not software. That's a haunted house you inherited — and you keep paying its utilities.
A fill-down across 12,000 rows with one wrong $A$1 quietly misstates revenue all quarter. No error. No warning. Just quiet, confident wrongness at scale.
Exhibit A: JPMorgan lost $6.2B to roughly this →Forty tabs. Three macros. One shaman. The org chart says "analyst"; the truth says "single point of failure with a cell tower." When Linda retires, your forecasting retires with her.
Who changed it? When? Why? Nobody knows. There's no history, no permissions, no log — just collective memory and Ctrl+Z's tragically short reach. Banks run on this. So does your group project.
No compiler. No tests. No code review. Just Sharon from accounting and a deadline. Field audits find errors in 88% of operational spreadsheets — not 8, eighty-eight. Would you board a plane that was 88% riveted?
See the museum for what falls out of the sky →Delete one tab and forty formulas across six sheets die screaming. The industry-standard fix is "paste the whole thing as values and never speak of it again" — which is how reason #10 gets its starter pack.
Is 03/04 March 4th or April 3rd? Depends on whose locale opened the file. Your "date" is now the number 45,019 wearing a costume. The UK once lost 15,977 COVID cases to a date-adjacent row limit nobody knew existed.
Exhibit B: The Vanished Cases →A filter someone applied in March silently excludes data from every sum since. The totals look fine. The totals have looked fine for six months. The totals are lying to you with total confidence.
Exhibit F: Barclays bought 179 contracts it couldn't see →Someone inserts one column in the source sheet and your lookup quietly returns the wrong data forever. No error. No warning. Just silently wrong at the speed of copy-paste — the worst possible combination: confident AND incorrect.
Q3_v7_FINAL_final_THIS-ONE(3)-updated.xlsx — version control by italics and prayer. Nobody knows which file is true. The answer is "the one Dave has open," and Dave is reason #8.
Good news: the exit takes four seconds. Drop the spreadsheet, get a real app — search, charts, forms, editable records — entirely in your browser. Nothing uploads. The grid never has to hurt you again.
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