How opposite day would end the world: First off, every one would switch gender, parental and child roles would switch, all edible foods would turn inedible, while already inedible idems, (trees, cars, ect.) Would become the new food. Also, cars wouldn't be transportation, rocks would! Not to mention the fact the oceans and continents would take each other's place. And to sum it up, the entirety of the solar system that doesn't have matter would turn to some tye of solid or liquid, while planets and every other solid would disappear. And that's why- (YT short loop)