From this video I have surmised two things. People in Denmark drink a lot of beer, and they have a lot of time on their hands.
This video has everything it takes to go viral. There's beer. There's dominoes. There's the funny set-up at the end and then there's the sheer amount of time this must have taken to put together. It still has fewer than 100,000 hits, though, which shows what I know.