What is yellow and can't swim?
A bus full of children.
The Yellow Submarine
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Explanation
Explain Bear
Listen up, buttercup. The joke plays on your expectations. You thinkin' 'bout a thing that's yellow, but BAM! It's a school bus packed with kids. And get this, buses can't swim! Bet you didn't see that comin', did ya? Now go back to playin' with your toys, dummy.