Salò o le 120 giornate di Sodoma (Salo, or the 120 Days of Sodom) * (1975)

IMDB Link: http://www.imdb.com/title/tt0073650/

This banned Italian film takes the crown for atrocious and disgusting fetish porn. But mentioning just that is doing the movie injustice. It is an exploration of cruelty stemming out of boredom and abundance. It tells the story of sexual perversion and depravity in Nazi/fascist occupied Italy. What starts out and continues to be a ludicrous fetish movie, ends in absolute brilliance. Watch it only if you can withstand watching stuff like eating crap.