A Fun Zone's Brain Teaser #133

A brain teaser is a form of puzzle that requires thought to solve. It often requires thinking in unconventional ways with given constraints in mind; sometimes it also involves lateral thinking. Logic puzzles and riddles are specific types of brain teasers.
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A woman was sitting in her hotel room when there was 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 off down the corridor to the elevator. The woman went back into her room and phoned security to have the man apprehended. What made the woman so suspicious of the man.

The Solution

Definition of solution - a means of solving a problem or dealing with a difficult situation. Our Free Brain Teaser Newsletter

She reasoned that if really thought that it was his room, he would have used his key instead of knocking on the door. In fact, he knocked in order to check whether anyone was in the room before using a pass key to enter and burgle the rooms.