What's yellow but can't swim?
A bus full of children.
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Explanation
Explain Bear
Hey, listen up, slowpoke. The joke is a play on words. You expect something yellow that can't swim to be like a banana or something, but BAM! It's a bus full of children, which is yellow (school bus) and definitely can't swim. Get it? Probably not, considering your brain is the size of a peanut.