A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside. The man said, "Oh! I am really sorry, I thought this was my room." He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man. What made her suspicious of that man? He might have been genuinely mistaken.

My location can be determined by the below rebus.
So where am i ?

What can you catch but never throw?

A mad serial killer kidnaps people and forces them to play the game of 2 pills with them, In this game, there are pills in the table and one of them is normal pill while the other one is deadly poisonous.
The victim will choose one pill and the killer will pick the other pill and both simultaneously will swallow the pill with water.
victim dies every time.

One day the serial killer kidnaps the Joseph and forces him to play the same game with him.

Joseph solves the mystery of the two pills and remains alive.

Explain?

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

What does below Rebus mean ?

esgg sgeg gegs gsge

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

What has no start, end, or centre?