Salò, or The 120 Days of Sodom (Salò o le 120 giornate di Sodoma)
The film's certainly not for the squeamish or the easily offended. In Salo, rape and sodomy are fairly pedestrian peccadilloes. Viewers are treated to a multitude of perversions, including feces eating, bloodletting, scalpings, and finally brutal murder. This film is guaranteed to gross out even the most hardcore of viewers at some point.