What made the woman so suspicious of the man ?

Question

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 ?

Answer 1

When that man enters his room and finds a stranger, his first response would be, ''who are u'' instead of Oh!, im really sorry ........................

Answer 2

if it was his room, he would be having the keys, this made her suspect...

Comments

The answer is not appropriate, what if the man had his wife/friend in his room?