What lies at the bottom of the ocean and shivers?
A nervous wreck.
Nervous Wreck
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Explanation
Explain Bear
Hey, dummy! Get this: A "nervous wreck" is someone super anxious. Now, picture that phrase literally as a wrecked ship at the bottom of the ocean. It's shivering 'cause it's cold and scared. You probably wouldn't understand this joke anyway because you're afraid of your own shadow, aren't you?