Catch-22
In Italy during World War II, malingering bombardier Yossarian's real problem is his own army, which keeps increasing the number of missions the men must fly to complete their service. Yet if Yossarian makes any attempt to excuse himself from the perilous missions, he’ll be in violation of Catch-22, a bureaucratic rule: a man is considered insane if he willingly continues to fly dangerous combat missions, but if he makes a formal request to be removed from duty, he is proven sane and therefore ineligible to be relieved.