Based on this article by the BBC, it appears to be more posturing by North Korea, but it got me thinking...
Has one nation ever gone to war/declared war against another nation based solely on some for of entertainment? Provocation based on a book, film, play, musical, opera, etc?
This is a bit different from the movie example you references, but there was the Football War. El Salvador and Honduras had a short-lived conflict in 1969 that escalated quickly after a World Cup qualifying match. The causes were definitely wider and deeper than the game, though. The tensions were already there, caused largely by the problems existing in Honduras and the blaming of those on immigrants from El Salvador.
Some good info on it can be found here:
Lindsey Barrett, Colby Leachman, Claire Lockerby, Steven McMullen, Matthew Schorr, Yuriy Veytskin, “The Soccer War,” at Soccer Politics Pages, http://sites.duke.edu/wcwp/research-projects/the-soccer-war/ (accessed on 6/25/14).