Imagine there are two identical boxes in front of you right now. Both of the boxes are tightly locked, but you have a key that can open either box; the key can open only one box and it vanishes. Contained within one of the two boxes is a power that will instantly heal the world, stop pain, misery, death, disease, despair and anything else you can think of that is horrible - this box will create a perfect world. Now, in the other box, is a power that will bring great misery, and death, and horrors beyond imagination - this box will create a Hell on Earth for an eternity. Now, you have the choice to a) open a box in hopes that you will get the paradise and save the world, the chances are 50/50, or b) leave the world as it is by leaving the boxes alone.
What would you do?
Also, feel free to discuss why you selected your answer! This is really what I'm looking for.