[mothered]

Poor people have it. Rich people need it. If you eat it you die. What is it?

Zero, zilch.

My turn:

You're In a room made from 6 Inch solid concrete- all four walls, the roof and floor. The door Is made of 6 Inch solid steel that's welded and cemented to the wall. There's no windows and you have no tools whatsoever. There Is a way to get out "within 5 seconds".
How?