A man is complaining to a friend about Uncle Ernie, who has just moved into a spare room in his house as a member of the family: "He's absolutely insane. He thinks he's a chicken. I'm not kidding: he really does fully believe that he's an actual chicken!"
"Well then why live with such an insane person? Why not simply kick him out of your house?"
"We would, but we need the eggs."
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