This appears to be more of a bad photoshop ad than much else. Not sure if this product is ever going to make it to market, I seriously doubt it will. The last thing I want to do is share saliva with a group of people just to play beer roulette.
You fill the barrel in the center with beer (it holds up to two liters) and then you take turns with your companions at pulling out the bottles underneath it. The right bottle will unleash a torrent of amber pain into the unfortunate puller’s gullet.