"God does probably not exist" poster in downtown Gothenburg. The ad mentions a web address, http://www.gudfinnsnoginte.se which I have not yet had a look at. A quick peek reveals that it is some sort of test. I will have a closer look later and report back!

Update, got a better picture of the poster. The campaign is paid for by the swedish organization Humanisterna . The test is in fact a "do you believe in god" test - and it's not bad. I can recommend taking it if you speak swedish.