Adapted from the classic, absurdist, anti-war novel by Joseph Heller. "Catch-22" is the story of Yossarian, a pilot who trys to opt out of flying bombing missions by being declared insane, the catch being that anyone trying to avoid bombing missions by being insane must be sane. This dark classic catches much of the flavour of the book, the insanity, the corruption and the absurdity of war. Think MASH, but non-linear - flawed but awesome.