xkcd #3276: Recursive Trucker's Hitch
Title text:
As if the americium smoke detector incident wasn't enough, now nuclear regulators have ANOTHER reason to worry about the Boy Scouts.
Transcript:
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Source: https://xkcd.com/3276/
Is that where the spherical cows are too?
That you find in isle 4: 3 dimensions or more and farm equipment
Used to be, until someone ignored air resistance and they all died.