'A Serbian Film' (2010)

A desperate-for-cash porn star agrees to participate in an “art film” that quickly turns gruesome, when murder, necrophilia and finally child rape are filmed for entertainment.

Number of Countries That Banned the Movie: 4. 

Currently has a temporary ban in Brazil, as well as an outright ban in Spain, Norway and Australia.  It was released with over four minutes of edits in UK.