All time favourite is an anti-war film set during WW1 called Johnny Got His Gun. Storyline is basically - guy goes to war (for democracy), guy gets blown up and loses ALL senses, his only communication being tapping his head using morse code, goes mad, fights madness and realises he went to war for a word. I'd love to see a remake set somewhere like Iraq or 'stan, think it would put the "war against Terror" into better perspective.
http://www.youtube.com/watch?v=CnL_tYRx_0Q