Curses have played a significant role in human history for over 4,000 years. Is it possible that supernatural forces can inflict harm, punishment or cause bad luck to befall us? Or is there another explanation? In our search for answers we examine some of the most intriguing curses including: the disappearance of Bill Barilko, James Dean's killer Porsche, Robert Johnson's deal with the Devil and King Tutankhamen's revenge from beyond the grave. Knock on wood.