Knock At the Door

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Dr Watson was staying in a boarding house. Whilst resting in his room, he heard a knock at the door and opened it to find a stranger standing outside who said, "Oh, this isn't my room! Please pardon the intrusion" and promptly left. Watson went down to the owner to tell him that there was a burglar on the prowl.

What made him think that?

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Answer to previous question: The neighbour was a photographer, developing a photo of his wife.

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