Is it a coincide the Cabinets of both the UK and Scottish governments are meeting in Aberdeenshire on the same day?
Of course not.
Nationalists recently criticised Mr Cameron for making a speech on independence... from London.
Now Number 10 says the Prime Minister will take the fight to Scotland tomorrow.
UK Cabinet ministers have met in Scotland on this level only twice in the last century.
- Read more: Cameron's Cabinet heads to Scotland
The Scottish Cabinet does hold regular meetings across the country but Downing Street claims it was first to chose Aberdeen for its meeting tomorrow - implying Alex Salmond's decision to take his ministers to the same area was all about diverting attention.
Either way, it means the two sides in the debate on Scottish independence will meet 30 miles apart on the same day.
Both the pro-independence and pro-union camps will point to the importance of the oil and gas industry to the Scottish economy.
The industry is headquartered in Aberdeen on Scotland's north-east coast.
First Minister Alex Salmond says the industry would be better supported and would grow faster under a Scottish government free from Westminster controls.
Those who oppose independence insist the oil industry benefits from being part of the larger UK-wide economy.
The boss of oil giant BP recently warned of the risks to his industry from independence in what was an unusual intervention in the debate from a senior business leader.
Both the Edinburgh and Westminster governments are expected to make policy announcements about the North Sea.
Although Mr Cameron says he is a passionate supporter of the UK - and privately dreads the thought of being the man in change when the country decided to break apart - he knows he must tread carefully in this debate.
An English privately-educated, posh, southern, privileged Conservative (who has only one MP north of the border) cannot be seen to lecture the Scots about their referendum decision in September.
It's the year he chose to hold this historic referendum.
Voters in Scotland have just 7 months now to make a decision.