What if you were supreme overlord for a day? You know, that one guy that rules the world. There is a guy like that right? Oh whatever. There will be now.
If I was supreme overlord, I'd rule with an iron fist and nuke the strongest countries existing. Then, the survivors will be my slaves and I will randomly kill one each minute, by feeding them cookies! Then I will nuke the entire Earth and celebrate on the ashes of the dying Earth!