When professional pundits are influential and the media are loud and both live by chilling our blood, general panics may become more frequent.

The chilling home-made video shows a young man staring out of a blood-red screen, pointing a gun and declaring: "I, as a natural selector, will eliminate all who I see unfit."

Chilling: Emma Watson has some serious vampire style as Hermione Granger in a blood-splattered poster for the new Harry Potter movie.