LOL:
“In 2015 we open our scariest attraction ever at Gröna Lund. This is how we told Stockholm their worst nightmare awaits …
In order to release our new attraction we did this scary street prank in Stockholm. On an outdoor poster we gave people a chance to get a preview of our coming attraction using their mobile phones. But what they didn’t know was that this was no ordinary ad. In fact, very far from it…
Gröna Lund, theme park in Stockholm, Sweden”