From the climactic final pages of Catch-22:
Yossarian crossed quickly to the other side of the immense avenue to escape the nauseating sight and found himself walking on human teeth lying on the drenched, glistening pavement near splotches of blood kept sticky by the pelting raindrops poking each one like sharp fingernails. Molars and broken incisors lay scattered everywhere. He circled on tiptoe the grotesque debris and came near a doorway containing a crying soldier holding a saturated handkerchief to his mouth, supported as he sagged by two other soldiers waiting in grave impatience for the military ambulance that finally came clanging up with amber fog lights on and passed them by for an altercation on the next block between a single civilian Italian with books and a slew of civilian policemen with armlocks and clubs. The screaming, struggling civilian was a dark man with a face white as flour from fear. His eyes were pulsating in hectic desperation, flapping like bat’s wings, as the many tall policemen seized him by the arms and legs and lifted him up. His books were spilled on the ground. “Help!” he shrieked shrilly in a voice strangling in its own emotion, as the policemen carried him to the open doors in the rear of the ambulance and threw him inside. “Police! Help! Police!” the doors were shut and bolted, and the ambulance raced away. There was a humorless irony in the ludicrous panic of the man screaming for help to the police while policemen were all around him. Yossarian smiled wryly at the futile and ridiculous cry for aid, then saw with a start that the words were not ambiguous, realized with alarm that they were not, perhaps, intended as a call for police but as a heroic warning from the grave by a doomed friend to everyone who was not a policeman with a club and a gun and a mob of other policemen with clubs and guns to back him up. “Help! Police!” the man cried, and he could have been shouting of danger.
Apocalyptic and ironic depiction of mob-rule and the corrupting-power phenomenon that has become known via the Stanford prison experiment.