Why did the leaf go to the doctor? It was feeling green
or
Why are seabirds so lucky in love? Because one good tern always deserves another.
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Which fish is the most famous in the ocean? The star fish!
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What happens when you throw a red rock in the Black Sea? It sinks to the bottom.
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Why did the farmer plant a seed in his pond? He was trying to grow a water-melon.
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What happened to the shark that swallowed a bunch of keys? It got lockjaw.