Director Martin Scorsese and screenwriter Paul Schrader have concocted a perfect movie with "Taxi Driver," which follows Robert deNiro's defining role of loner cabbie Travis Bickle.  The claustrophobic sets and tight cinematography, Bernard Herrmann's curiously tasty mix of polyphony and jazz in his final score, and the ever-present foley effect of an alarm clock ticking (connoting Bickle's state of mind of mental deterioration, a human time-bomb waiting to explode) all make for a highly personal character study of this self-described "God's Lonely Man."