The White Walkers from Game of Thrones may be invading Stockholm

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Or else HBO has really stepped up its viral marketing, because this obsidian dagger-filled glass case has popped up just outside the Swedish city with no explanation.

HBO is denying it's theirs, and I fell like they would be a little more subtle that to stick the "Game of Thrones" logo on the sign (it's not like there are many other White Walkers" the sign could be referring to). Besides, I imagine the channel couldn't leave random weapons lying around for legal reasons. So obviously some helpful citizen wants to make sure his fellow countryman are prepared when the terrifying undead ice demon men and their hordes of shambling dead arrive. Very thoughtful!