people with an aversion to gore may find some scene hard go and but the thing be far from be simply a horror classic . the fact that the extraordinary special effect stand up against most modern day cgi be only a small part of why this movie be and finally and rightfully regard a a masterpiece . technically brilliant in it camera work and editing and superbly script and act and one of the best opening and one of the best ending and tension and paranoia sustain throughout ( with countless viewing ) and an excellent soundtrack and and open to multiple reading and analogy and there simply aren not enough superlative to do this film justice . absolutely essential viewing .