Really: what if spilled milk was the end of the world? First of all, there would have to be some gigantic source of milk (maybe there really is a giant cow somewhere in the Milky Way Galaxy?), then the milk would have to go into orbit somehow, and then somehow saturate the atmosphere with milk. Could you imagine if it was raining milk? They do say that milk bathes are good for your skin. Maybe then it wouldn't really be the end of the world after all? I would have to say: it would suck to be lactose intolerant in those last days, that's for sure. 2012: The Year of End-of-the-World What-ifs :)
