-The sky rains fire.
-Something like a Zombie Apocalypse actually happens... (doubtful, but still unsurprising if at all plausible)
-We invent/progress toward: space travel, automail (biomechanics), dive technology (neurological electronics), possible underwater/lunar colonization, limited teleportation (in theory), and the move to inventoried, digital systems for civilization (examples of this would be something like those medical chips they're putting in babies and elderly people...makes you easy to track)