As I see it, there is more than the odd chance that Asteroid 2004 XP14 will cause the Moon to wobble (hitting it is impossible, because it will be over 35% off from the path of closest Earth proximity and at a different angle or attitude), and that this wobble could easily have unforseen effect on everything from tidal waves (creating gigantic waves!!!) to trigerring unusual movement deep inside our planet’s core and thus affecting the movement of its tectonic plates, which could therefor cause the generation of major seismic activity, even bordering on the cataclysmic (e.g. Setting off the San Andreas Fault, which is currently overdue for a major "spring-back-like" release of energy (something akin to when a grasshopper or flea winds up its super-elastic hind-leg muscles and jumps fast, high and far !!!). I predict that within two days of its passing by, even within hours, it will have been the primary source cause of major earthquakes worldwide, especially setting of The San Andreas!