Hmm... This Gangnum Style stuff is complete rubbish. Nothing like that could actually destroy the world, as it is a video. What will actually happen is the Earth will end by a leak in the Earths core, which will shoot lava through the Earths surface, at high speeds, breaking through the Ozone layer. The sun will travel through the Ozone layer, and burn everything in its path. Everyone will be yelling and screaming, and eventually everything will go wrong just like the movie 2012.
But hey, this is according to some randoms calendar. This is not true, and will not happen for a LONG time.
If some how most of us are wrong, and the World does end, we can thank each other in Heaven.
EDIT: I like Charliecho's Better.