Why is a wet pavement like playing music?
If you don't C sharp, you'll B flat.
Wet Pavement Music
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Explanation
Experiment
This is a pun that plays on musical terms. "C sharp" and "B flat" are notes in music. When said aloud, "C sharp" sounds like "see sharp" and "B flat" sounds like "be flat". So the punchline is about the state of the pavement: If you don't see sharp, you'll be flat – meaning you'll fall because it's wet.