M*A*S*H
This off-beat, dark comedy, set in a Mobile Army Surgical Hospital (MASH) during the 1950s Korean war, was a thinly veiled criticism of the Vietnamese war being fought at the time (1970). Directed by Robert Altman, it features a group of surgeons, nurses and orderlies who retain their sanity in the face of terrible trauma by their joking and pranks, and anti-authoritarian behaviour.