This month’s Slamdance Film Festival carries only one horror film, Fernando Barreda Luna’s Paranormal Activity-esque Atrocious , which we first told you about back in October. Gearing up for the festival premiere, Moviefone is hosting the “official” NSFW trailer that you’ll find below. In April 4th of 2010, Quintanilla family was found murdered in their country side house. Police reported the existence of 37 hours of recorded evidence. Atrocious shows the real images of such evidence. Quintanilla family traveled to their old farm house in Sitges, where Christian and July investigated about the Legend of the Girl in the Garraf woods. Both of them used to record all day whatever they did. On the fifth day of their arrival they were found dead under strange circumstances. Atrocious shows the last five days of life for Cristian Quintanilla and his siblings. It also shows the strange situations that they lived in those moments and which remain unexplained.