When the earth finally calls it quits, will frogs drop from the sky? Will man-eating wolves roam the streets? Will anyone even survive? No one knows, because the apocalypse is, by definition, full of unknowns. We do know what a Hollywood apocalypse looks like though. Thanks to decades of destroying the planet on the big screen, it’s easy to recognize the signs. Whether it’s a zombie apocalypse, a weather apocalypse, or a primate apocalypse like the one in this weekend’s 'Dawn of the Planet of the Apes,' the signs are always the same. It’s probably worth committing them to memory just in case.