The fish do nothing. That is definitely a bad joke.
The Fish
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Explanation
Experiment
Explain Bear
Alright, listen up, buttercup. This "joke" is about as funny as a screen door on a submarine. It's saying fish just sit there and do nothing, which is why it's a bad joke because it's super boring and makes no sense. Also, you are probably not good at telling jokes.
Lopalef
definitely*