It was 12 midnight. A security guard in a 4 storey hospital was on duty that time. He checks around the hospital to see if everything was in-order. He finished checking the hospital, He was on the 4th floor of the hospital then he ride the elevator going down. On the 3rd floor the door of the elevator opened. The security guard got shocked because no one was there. The door closed. On the 2nd floor the door opened again and no one was there again, the security guard got nervous. As the door closed there was a beeping sound, that beeping sound is an alarm for overloading in the elevator.
-WEI?