In November, 50,000 printers started suddenly printing a message urging recipients to subscribe to PewDiePie—YouTube’s most popular star ever, with 80 million subscribers. It came with a warning, too: That the printers were hacked because they were dangerously exposed to the internet.

A month later, the same hacker, known as HackerGiraffe, struck again, this time hacking smart TVs and Chromecast devices to autoplay a video promoting PewDiePie and urging them to fix their exposed devices.

Things only got crazier from there.

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