Good Riddles

Question: Imagine that you enter a room, but the door shuts behind you and you are locked inside. The room is 3 meters high, and 6 meters x 6 meters as a square form. It is dark, the floor is metal just like the walls and the ceiling. You cannot destroy the walls, ceiling, floor or door. How to you get out?

Question: Occurring once in a hundred years and once in thousands. But never in a day or a year or a century.

Question: Having one, means having something to follow. Once you question it, it means having none. People seek it, but some do and some don't find it. What is it?

Question: Having some, you want more. But when you have too much of it you feel bored. Everyone people wants it, and some have to much of it. What is it?

Question: When angry it turns red, cold it turns blue and pale when scared.