Mind Blowing Detective Riddle

Cindy was in her hotel room enjoying a pizza when she heard a ring on her door.

She went to the door and asked who was there.

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There was a man on the other side and he said nothing.

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Cindy opened the door and asked the man what did he want.

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He then went to the elevator.

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Cindy went straight to her phone and called the reception saying

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There was a dangerous man in the hotel and he should be caught quick.

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What made Cindy doubt the man ?

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ANSWER If the man claimed this was his room, why did he ring ? If it was his room, he should have the key and would have come straight in.

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