For nearly 20 years Sony in Japan has been plagued by the myth of the "Sony Timer" – but is there really a kill-switch that destroys your device just after its warranty runs out? Many Japanese genuinely believe that there is.

It was the recall of more than 4.1 million Dell laptops containing faulty Sony batteries in 2006 that jump-started a rumour that has been around for decades. From 1980 to 2006 geeks and tech-obsessed Japanese had joked about the existence of the timer, creating sarcastic manga and venting anger through online forums.