TAXI DRIVER is the un-relenting tale of one man's journey into insanity while driving a cab on the streets of New York City.  The many situations that Travis Brickle (a bloody brillinat performance by Robert DeNiro)  encounters and the many people he meets while drivng this cab at night send  him into a downward spiral of hate and contempt for everyone and  everything.  The fact that he is a Vietnam vet really seems to play a role  in how affected he is by this incredibly obscene and disgusting society.  Being dumped by a woman with whom is incredibly fond of, in addition to  meeting a 13 year old street hooker all further establish as a sort of  morality tale which questions both our society, and the people affected by  it.  The harsh yet mellow aura of the film is sharpley interupted at the  end by an incredibly violent climax which may be too much if you're not  expecting it.