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ピンと来た

Why does a dog wag its tail?
Because a dog is smarter than its tail.
If the tail were smarter,the tail would wag the dog.
（なぜ犬は尻尾を振るのか？
　　それは尻尾より犬が賢いから。
　　尻尾のほうが賢けりゃ尻尾が犬を振る）