I think it's fake. Anyone drunk enough to lurch that much would fall down more, just for one thing. This guy is like in a cartoon, weaving back and forth. And then he falls flat on his back, but doesn't bang his head on the sidewalk? Nice muscle control there. Notice, too, how he always seems to know where the camera is.
This has a million hits, though! We should capitalize; we should get Danny as drunk as he'll get and record him knocking down a house with a sledge hammer. There's money to be made on haplessness!