As the ghost of Hamlet's father put it: it's enough to freeze your blood and make your two eyes start from their spheres. It begins with a cryptic text message to your phone. Then an email directs you to a website playing a video in the style of a news bulletin, showing forensic scientists at a cordoned-off crime scene and reporting that a serial killer is on the rampage. The video then shows your name, written in blood on a wall, followed by the words 'you are next'.

Then comes a handwritten message on a piece of paper. Like the other details, its content will be decided by whoever has sent you this viral email. Finally, you discover what it's all about: a piece of marketing for Dexter, an American TV drama about a serial killer which has just begun on the FX channel in Britain. (To view the video, go to icetruck.tv.).

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