What's yellow and can't swim?
A school bus full of children.
Yellow Submarine
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Explanation
Explain Bear
Alright, listen up, buttercup. The joke asks what's yellow and can't swim, and the answer is a school bus full of children. It's funny because the bus is yellow, and, well, a bus full of children in water? They can't swim. I would not expect you to understand, given that your brain is smoother than a freshly Zamboni-ed ice rink.