The Mysterious Man

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

Answer: You don't knock on your own hotel door, do you?

Source: https://www.riddles.com/index.php/4963

A woman is sitting in her hotel room when there is a knock at the door. She opened the door to see a man whom she had never seen before. He said, "Oh I'm sorry, I have made a mistake, I thought this was my room." He then went down the corridor and in the elevator. The woman went back into her room and phoned security. What made the woman so suspicious of the man? — The mysterious man by Heecat v1.

Riddle: A woman is sitting in her hotel room when there is a knock at the door. She opened the door to see a man whom she had never seen before. He said, "Oh I'm sorry, I have made a mistake, I thought this was my room." He then went down the corridor and in the elevator. The woman went back into her room and phoned security. What made the woman so suspicious of the man? Answer: You don't knock on your own hotel door, do you? — by Heecat v2.