The world, 520 years later, and the subject of Japan in the evening.

Just went for a sandwich near Liverpool Street.
This drunkard decided to sit next to me, and he provided ample entertainment.
As well as drinking white wine from the bottle, chain-smoking and swearing profusely, he also seemed to have a unique twist on the world as a whole.
At one point he exclaimed "The world became as one in 1485 - what have you been doing since then?". When no reply was forthcoming, he began a rather convincing rendition of the Beatles classic 'Yesterday', only to stop halfway through and shout "Fucking arseholes! Fucking cunting arseholes!" to no one in particular (at that point I realised that I had probably more or less been doing the same thing as he had in the last 520 years, i.e. drinking and swearing and generally not making sense).
Minutes later he invited everyone to stand up (which was smooth considering he was the only person sitting down). The desired effect was clearly not reached, and he began almost pleading with the passers by to just stand up. Seconds later it was forgotten, and he returned to his eloquent monologue.
By the time I left he was trying to convince his surroundings that Japan DID sound better later in the evening. He was obviously not well, but who is?