Scrooged [PN1997.2 .S37 1999] Cross, who made the meteoric rise from the depths of the mailroom to TV network presdient, is mean, nasty, uncaring, unforgiving and has a sadistic sense of humour - perfect qulaities for a modern-day Scrooge. Before the night is over, he'll be visited by a maniacal New York cab driver from the past, a present-day fairy who's into pratfalls and, finally, a ghoulish, seven-foot headless messenger from the future.
Surely not a movie for everyone; perhaps the best example of a sociological character study if I've ever seen one. The insight into a psychopath is quite unsettling yet unfiltered. On one level, at least mine, it's kind of fascinating, even though it's also exceptionally disturbing.
Taxi Driver (1976) - A mentally unstable Vietnam war veteran works as a night-time taxi driver in New York City where the perceived decadence and sleaze feeds his urge for violent action, attempting to save a preadolescent prostitute in the process.