There are times when I am proud to be an american.

Pueblo was taken into port at Wonsan and the crew was moved twice to POW camps, with some of the crew reporting on release they were starved and regularly tortured while in North Korean custody. This treatment was allegedly worsened when the North Koreans realized that crewmen were secretly giving them "the finger" in staged propaganda photos.[1] In fact, one of these photographs — which at a glance shows the crew relaxed and smiling — covertly used sign language to convey the message "SNOWJOB" (an American colloquialism for a lie or cover-up). The photograph was presented to the West as an example that the crew had supposedly decided to defect. The message was subsequently detected, however, and stands as an excellent, if unconventional, example of steganography.
-http://en.wikipedia.org/wiki/USS_Pueblo_%28AGER-2%29