There are numerous nuclear holding countries, and yet N. Korea is the only one people whine over when a nuke is tested. They're not going to bother America, because as arrogant as they may seem they know they wouldn't win. The only really plausible explanation is what quiet said thirdly. They're just talking big to keep anyone from bothering them. If you're in a room full of edgy people with guns, and you've got a gun too, wouldn't you let people know you've got one and it works, so that you're not seen as the weak Korean nerd with big glasses and retarded clothes?
Analog's underwear are digital. right now they're set to inverse 1 (I think that means they're on my head).