The 400 blows is one of the movies that I would never forget, the photography, the action of Jean-Pierre Leaud and especially the music, were elements that make this movie a good one. I really don´t know the meaning of the title, but I think that it could be related with what Truffaut wanted to show at the movie, which was not only expressing most of his experience at his childhood, but also to show the contrast between the meaning of what crime represents for a boy and for an adult, because to a boy it has been taught to him that even the most innocent action is a crime, whereas an adult can crash his car against a tree and this simply represent an " accident", an that is evident at the film since Antoine was punished for the smallest of the incidents at the school. well I hope someone would understand what I tried to say, my english is horrible.