" He did another experiment, the Startle Reflex Test, in which psychopaths and non-psychopaths were invited to look at grotesque images, like crime-scene photographs of blown-apart faces, and then when they least expected it, Bob would let off an incredibly loud noise in their ear. The non-psychopaths would leap with astonishment. The psychopaths would remain comparatively serene. Bob "

― Jon Ronson , The Psychopath Test: A Journey Through the Madness Industry