Being at war is a dirty business, but it seems that at one point North Korea took this concept of it being dirty to a whole new level.
In order to annoy and disrupt South Korea, it is claimed that North Korea decided to go ahead and drop what is known as poo bombs on the south. That is literally a package that contained poo knowing that South Korea would have to use people to open the packages carefully and slowly to determine if there was some kind of biochemical hazard in the package.
You can only imagine their surprise when they noticed what was contained within it and they then had to deal with the offending weapon. This could hardly hurt someone, but the chaos that surrounded them firing these bombs into enemy territory meant that it was still able to cause some disruption.