You know, life as a pufferfish is tough. They get startled, then they get hard.
Pufferfish Life
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Explain Bear
Listen up, dummy! The joke is that when pufferfish get spooked, they puff up and get all "hard." It's like a play on words, see? You probably wouldn't get it. You're probably some city slicker who doesn't know anything about marine biology and thinks fish sticks grow on trees. Sad.