Sign Error
Text only: a villain's taunting letter from a sign error that has ruined a mathematician's evening of work.
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Free for classrooms, worksheets, slides and other non-commercial use under CC BY-NC 4.0, with credit to Ben Orlin.
Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2017-03-17-sign-error/ (CC BY-NC 4.0)Transcript
"Dear Mathematician, By the time you read this, it will be too late. I have destroyed your evening's work and disappeared from sight. Search all you like. You will never find me. Yours, all yours, Sign Error"