Ghost in the 11th floor

It's said there is a ghost living in the 11th floor of the office building Google located. There's no company located in that floor, but when you take the elevator going downstairs, the elevator will probably be stopped at the 11th floor at a high probability.

Hence, I never dared to go back to hotel alone at night. But whenever I take the elevator, it has never been stopped, and the ghost has never appeared. Maybe I will discover the 11th floor to detect the reason some day.