It's December 21st and the world hasn't ended yet. Luckily, someone put together a montage to show what it WOULD have been like. It's clips from 38 different movies about the end of the world, in under three minutes.
(--It's set to the Nine Inch Nails song, "Just Like You Imagined." Search for "38 End of the World Movies - Supercut." The YouTube description lists all the movies they used.)