It is fair to say that no one was expecting John Key to announce his resignation yesterday.
There had been some talk over the past few weeks that while Mr Key would probably take the National Party to a fourth term of government next year, he would have stepped down midway through the cycle.
But, yesterday's announcement was nothing short of a bombshell.
It immediately raised the question of why? There are many theories going around and one, or more of them, may even turn out to have some truth to it. Almost certainly there was family pressure.
But if you look at it, in hindsight it does make sense. Mr Key made millions as a trader and those instincts allowed him to successfully use a brand of practical populism in his political career.