Possibly one of the most powerful pieces of psychological warfare ever written, by Cordwainer Smith:
"I love honor, I serve humanity." Speak these words in front of a United States Army Officer, then throw down your weapons. The war will be over for you. You will be in the good keeping of the United States Government, and will be returned to your family with no harm.
The beauty of this is that, pronounced in Northern dialect Chinese, it sounds very much like "I surrender." Also, that he meant every single word that he said.