Alex Salmond's dramatic move - after a night of drama in Scotland and a day of confusion in Westminster - adds another variable to the outcome of the constitutional crisis.
If it's rough, and profane, it's because that's what street politics are like when ideologies collide. That's what it was like when class defined British politics.
Maybe you can't have a strident British nationalism. Maybe that's the subtextual mistake all those lectern-banging politicians have been making.
The Renton test is simple: can your argument sway someone like the junkie Mark Renton in Trainspotting? His tirade to the deserted hillside is now etched into Scottish folk memory.
There are a panoply of risks associated to Scottish Independence. The transition risks might be survivable, but goodwill is required from London and Edinburgh if it is going to work.
If the yes camp wins next Thursday it will be, in large part, because in addition to the SNP, this "non-party" broad coalition has inspired people.
As the Eurozone project goes on failing, it is dragging the institutions and economies of Europe into a zone of disrepute that will drive anti-EU sentiment here.
Of the big macro issues - banking, debt, oil and the pound - the most critical is banking. But a desire to reject free markets, privatisation and high inequality will also play its part.
Sit down with any Palestinian over the age of 50 on a street in Gaza and, if you're British, you'll soon be discussing Arthur Balfour.
The intensive care unit at Khan Younis hospital is so full, they have set up a makeshift one as the bombs pound nearby Rafah and its UN school.
Today in Gaza the death toll stands at 1,635. If the public health system collapses, without a major inward flow of emergency relief, killer epidemics are a real danger.