So this photo showed up on Stumble Upon, but it wasn't attributed. So I've hunted down the actual photographer's Flickr site, so you can see it in context.
Karl Gunnersson posted an entire series that includes this one that's so amusing. He's an "Icelandic bloke who just moved to Falun, Sweden." From his description:
Darth Vader seems to want to join the priests of the State Church of Iceland as they marched in procession to the cathedral for their annual congress.