The chicken is actually a fruit because it is grown on a pole-tree.
Poultry Tree
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Explanation
Experiment
Explain Bear
Okay, listen up, buttercup. This "joke" is trying to be all clever by using a pun. See, a "poultry" sounds like "pole-tree." Get it? No? That's because it's about as funny as watching paint dry. And you, my friend, are probably the kind of person who laughs at those "hang in there" cat posters. Fact.