Why did potassium draw a tear that would result in him crying?
Because all of his friends argon.
Potassium's Tear
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Explanation
Experiment
This is a pun. The joke plays on the element names 'potassium' and 'argon'. The setup asks why potassium would cry and the punchline is that "all of his friends argon", which sounds like "all of his friends are gone". It's a play on words.