Evil Mathematicians: sin⁻¹ vs. sin²
A villain gloats over making sin⁻¹(x) mean arcsin(x) while sin²(x) means (sin x)².
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Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2017-02-01-history-s-most-evil-mathematicians--evil-mathematicians-sin-vs-sin/ (CC BY-NC 4.0)Transcript
Villain: "I'll have sin⁻¹(x) mean arcsin(x), but sin²(x) mean (sin x)(sin x). Heh heh heh…"