World War III?

For a long time, everyone thought World War III would be fought with nuclear missiles. How boring!

The later it starts, the more awesome it will be.

Cracked on World War III

The last two world wars were started in Europe. Time for a change!

Example? If by any chance North Korea someday reunites with the South, they would have the largest military force in the world. While the west still negotiates whether they should soften Kim-Jong Il's champagne embargo, Korea could conquer half of Asia.
With no one left to actually remember the horrors of the last World War, it's quite likely that soon earth would be shattered by that damn things that someone managed to turn into an awesome picture:

Showing this will never get old.