L'Hospital
An injured limit lies on the ground after a student applied L'Hôpital's rule to a limit that wasn't indeterminate, getting the wrong answer.
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Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2018-10-18-l-hospital/ (CC BY-NC 4.0)Transcript
A: "What did you do to this poor limit?"
B: "I differentiated the numerator and denominator."
A: "But... WHY??? It was perfectly healthy!"
B: "I was just trying to help..."
[Limit on a stretcher: lim(x→5) e^x/x =(L'H)= lim e^x/1 = e^5]
[Caption] "Overuse L'Hospital, and you'll put 'em in the hospital."