Swedish theme park Gröna Lund placed a ghost in a poster to scare people in Stockholm.

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On the poster we gave people a chance to get a preview of an upcoming attraction using their mobile phones. But what they didn’t know was that this was not an ordinary ad. In fact, very far from it…

More info: Youtube

The poster could either be interacted with using the qr-code or by visiting a website

After visiting the website, a splash BOO! appears on a smartphone’s screen. And then the poster comes to life scaring the victim