Because it's the purest American road movie ever.
Because it's like a drive-in movie directed by a French New Wave director.
Because the only thing that can get between a boy and his car obsession is a girl, and Laurie Bird perfectly messes up the oneness between the Driver, the Mechanic, and their car.
Because Dennis Wilson gives the greatest performance ever by a driver.
Because James Taylor seems like a refugee from a Robert Bresson movie.
Because there was once a god who walked the Earth named Warren Oates.
Because there's a continuing controversy over who is the actual lead in this movie. There are different camps. Some say it's the '55 Chevy, some say it's the GTO.