Such is the panting, hyperactive state of the referendum campaign that FMQs gave birth to not one but two catchphrases today, as Alex Salmond painstakingly continued not to answer questions about a Plan B on the currency.

Reassembled and reanimated after being sliced and slaughtered by Alistair Darling on TV two days earlier, the FM appeared in a good mood as Labour's Johann Lamont took to her feet.

But like his infallibility in debate, it didn't last long.

"In the increasingly unlikely event that Scotland votes yes and in the likely event that the First Minister is unable to agree a currency union with the rest of the United Kingdom, can the First Minister tell the people of Scotland: what is plan B?" asked Ms Lamont.

Cue the first catchphrase of the day.

Hoisting aloft a copy of the sacred text, Mr Salmond replied that the answer was revealed on "page 110 of the White Paper".

Admittedly it's not much of a zinger, but he went on to use it another eight times.

Alas, it later turned out that p110 contained an embarrassing schoolboy error which muddled up sterling and a new Scottish currency.

But, hey, the FM also came armed with a second, rather snappier slogan.

Insisting neither George Osborne nor Ed Balls could stand in the way of "the greatest authority of all - the sovereign will of the people of Scotland" by denying a currency union after independence, he declared: "It's Scotland's pound, and we're keeping it."

Catchphrase No2 chalked up six uses.

Expect to see it on Yes posters soon, no doubt, alongside: It's Scotland's Queen, and we've bagsied the old dear; It's Scotland's oil and you're having none of it; and It's your nuclear deterrent, you know where you can shove it.

Referring to reports of SNP backbiting against Mr Salmond, Ms Lamont drawled: "I do not know what Nicola Sturgeon made of that answer, but I dare say that I will read what she thought from an unnamed source in tomorrow's papers."

Asked again for Plan B, the FM again turned theatrically to p110, and said, although a new currency was "perfectly viable", it wouldn't be as good as sharing the pound.

Oh, and by the way, "It's our pound and we're keeping it."

Ms Lamont flicked a talon at the SNP's MSPs.

"That might convince the First Minister's back benchers, but it will not convince anybody who lives in the real world," she said.

"It is not for the First Minister, no matter how limitless he thinks his powers are, to determine what is in the national interest of another country.

"That is not within his gift to decide."

Mr Salmond suggested that if Scotland were denied its share of assets like the pound, it wouldn't take its share of the UK's £1.3 trillion debt.

Would the PM, George Osborne and Ed Balls really go into the next general election telling voters to pass up the chance of £5bn a year in debt interest payments from Scotland?

"That is why the best interests of Scotland - the sovereign will of the Scottish people - will prevail. It's our pound.. etc etc"

And so it went on and on.

Tory Ruth Davidson had another pop, accusing the FM of "trying to lead the Scottish public up the garden path" by pretending he could deliver a currency union on a plate.

"The First Minister often likes to pretend that he speaks for all of Scotland, but he is now claiming to speak for all of England, all of Wales and all of Northern Ireland, too.

"Will he admit to the people of Scotland in this chamber right now that, if there were to be a yes vote, a currency union would not be in his gift to give?"

You can guess what came next.

LibDem trier Willie Rennie said the FM wasn't "being fair to the people in Scotland" by not naming a Plan B or its consequences.

He got two Page 110s and two 'It's our pounds' for his trouble.

Later, a patsy backbench question about independence being vital to save the (wholly devolved) NHS in Scotland provoked a furious interjection from deputy Tory leader Jackson Carlaw.

"Can the First Minister confirm when it was during the summer recess that the Scottish Government's referendum advice became so desperate that ministers felt that their only recourse was to indulge in malicious, unsubstantiated, shameful and shabby scaremongering?"

The FM loved everything frothing syllable of it.

"We seem to have touched a new nerve of the No campaign," he beamed.

"We will take no lectures on scaremongering from a No campaign that is based entirely on scaremongering among the Scottish people."

After all that talk about the pound, it was a touching reminder that there are some things in life - love, a child's laughter, the bedroot-red coupon of a noised up Tory - that money can't buy.