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?
What made the woman so suspicious of the man is the fact that he knocked on her door. If he thought it was his room, then why wouldn't he just use his key to enter the room, instead of knocking on his own door? This is what is suspicious about his behavior, and the woman understood that this man may be a thief so she called security.
