If there's one movie on this list which takes the concept of sadism well beyond the boundaries of titillation and into the realms of the psychopathic it is Pier Paulo Pasolini's fascist commentary, Salò, Or The 120 Days Of Sodom. Few films are as likely to disturb and repulse the viewer as much as this. Set after the fall of Mussolini's dictatorship in Italy, 1943, Salò, Or The 120 Days Of Sodom explores the depths of depravity of the political elites and can be seen as a metaphor - albeit a rather obvious one - for the corruption of power. Based on the book by the Marquis de Sade this is truly grim viewing not for the weak stomached, with scenes of torture giving way to carnage which resembles a snuff film. If you want to provoke a reaction from someone, show them Salò, Or The 120 Days Of Sodom.