The Hammer of Paradox
An emergency hammer locked in a case whose only instruction is to break the glass if you lack a hammer.
Use this cartoon
Free for classrooms, worksheets, slides and other non-commercial use under CC BY-NC 4.0, with credit to Ben Orlin.
Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2019-01-17-the-hammer-of-paradox/ (CC BY-NC 4.0)Transcript
[Sign] "IF YOU LACK A HAMMER, BREAK THE GLASS" [a hammer inside a glass case]
A: "But… how??"
[Caption] "The Hammer of Paradox"