One of the sillier threats made by North Korea, in 2013 a photo was release showing lines of soldiers strapped to backpacks with the international symbol for radiation attached.

The takeaway being that these men had nuclear weapons strapped to them and we ready to go out into the world and attack. Though it is not believed that North Korea has atomic weapons capable of fitting into a backpack, these were probably just for show and to create the reaction that it did.