On the [Main Menu] select the [Sewer Dwelling Special Features] 
menu entry that will take you to the [Special Features] section. 
From there highlight the word [Main] and then press the [Left] 
arrow key on your remote control. A small bone will appear in the 
mouth of a man in the background. Now press the [Enter] key and you 
will get to see a trailer for "Cannibal Holocaust".