House Left as an Exercise
A detective examines a wrecked, abandoned house and concludes it was 'left as an exercise for the reader.'
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Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2018-03-02-house-left-as-an-exercise/ (CC BY-NC 4.0)Transcript
A: "My word. This house looks like it was abandoned for centuries, then trashed in a fit of rage. What happened, Detective?"
Detective: "There's only one explanation for this combination of dereliction and blind fury. The house was left as an exercise for a reader."