A woman is sitting in her hotel room when there is a knock on the door. She opened the door to see a man she had never seen before. He said "Oh I'm sorry, I have made a mistake, I thought this was my room." Then he went down the corridor and into the elevator. The woman went back into her room and phoned hotel security. What made the woman so suspicious of the man?

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50 Riddles & Answers [COMPLETED]
RandomDISCLAIMER: These are not mine. Includes 50 tricky riddles with answers published after every five. Good luck!