The rapid succession of scenes clearly establish the monotony of the man's life.  A life revolving between work, home and a brief stop at the pub. There is minimal  interaction between him and other people and viewers presume that this man has no social life and not even a single family member.  The  overlapping mundaneness  finally  has him caught up and  somehow  causes  something to break,  which may be why he , for no reason at all, attacked a man. Quite disturbing but engaging because of the  fast-paced action and scenes; this film  invites viewers to reevaluate our own lives and for a moment think of the possibilities that could  present itself, if  we are faced with the same scenario.  Do check out this film, folks!