MYSTERY No.0021 · Solve on your own

Back for His Umbrella

A cat detective seated on a night train, holding a closed umbrella
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A man went back to his office to pick up an umbrella he had left there. Because of this, he nearly missed the last train and ran to the station. He managed to catch the train, but once he sat down, he thought, “I wish I hadn’t gone back for the umbrella.” Why did he regret going back for it?

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