Skiing
Two skiers at a black-diamond sign: one explains steepness with slope notation (m > 1), the other worries that means going uphill.
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Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2018-03-22-skiing/ (CC BY-NC 4.0)Transcript
A: "I don't get this weird notation. Is this slope supposed to be hard or easy?" B: "Well, on a black diamond slope, assume m > 1."
A: "You mean... I'll be going uphill?"
B: "For a language that prizes clarity, math doesn't seem to clarify very much." A: "Oh, I get it! I'm parametrizing a curve where dx/dt < 0. You should have just said so!"