That's a great video. I won't have so much as a single beer when I ride. If I ride with guys to a weekend destination I won't consider having a drink until the bike is put away for the night.
The trouble is, even a couple of beers or shots, though you may not appear buzzed, it takes away some inhibitions that keep you sharp and aware of your surroundings while riding. You can control the bike just fine but you ride stupid.
Even a mild buzz is bad on a bike. Many do it and I often wonder how.