This 1971 American anti-war film written and directed by Dalton Trumbo wasn't initially well-received, but it gained respect for it's anti-war take on World War I -- so much so that President Carter required his incoming Georgia State cabinet members to watch it shortly after he became the governor of Georgia in 1971.
"Johnny Got His Gun" focuses on the nightmare view of war through the eyes of an injured soldier during WWI. Clips from the movie were used in Metallica's "One." The band eventually bought the rights to the movie because it was less expensive than paying royalties every time the video was broadcast.
Scarier than hell.