Psychological weapons, that is. Psychological warfare has some of the most powerful attacks on a population. One recent example has to do with Christmas trees and the Koreas.
South Korea has allowed a church group to hang lights around a 100-foot tall structure. When illuminated, it resembles a Christmas tree, complete with a cross at the top.
The tree can be seen from the North Korean city of Kaesong. North Korea has labeled it as psychologic warfare, while South Korea says it's just a way to promote freedom of expression.
Read more about this interesting conflict here