With all due respect to his position as Prime Minister of New Zealand, the more I see of John Key the more he reminds me of a kid with a new toy.
His unalloyed glee at being the nation's leader seems never far from the surface, no matter where he is or who he's with.
During a half-hour address to 300-odd of Rotorua's movers and shakers at a lunch organised by the local Chamber of Commerce, he unashamedly announced that being Prime Minister - "the last train stop on the planet" - was "real cool" and "bloody good fun".
And a little later, during a 1 hour visit to the decile 3 Owhata Primary School, Mr Key told the children in answer to questions: "It's lots of fun being Prime Minister. You can tell everyone else what to do.
"And you get to do some really cool things, like visiting Antarctica and being invited into the All Blacks' dressing room. I've met the Queen and other prime ministers - lots of really amazing things."
Mr Key, accompanied only by two unassuming diplomatic protection squad members and a friendly personal assistant, is welcomed to the school by two stately kuia of the Owhata marae.
As the Pirimia (Prime Minister) ambles - he never seems to stride - into the assembly hall, he is closely inspected by 300-odd wide-eyed children, more than 90 per cent of them Maori, while the school's kapa haka team greets him with waiata and haka.
Then the questions begin.
Our Prime Minister rises at 5.45am and gets to bed about midnight. He attends up to 15 meetings a day, the first as early as 6am.
He played club rugby when he was younger but nowadays plays touch when he gets an opportunity; one of the favourite parts of his job is "coming to see boys and girls like you"; and he and his family have a cat as a pet.
Why did he want to be Prime Minister? "I thought I could make a difference to the future of New Zealand. You are the future of New Zealand and I want you all to be able to achieve what you want achieve."
He told the children about his school days in Auckland and Christchurch, and admitted looking forward to meeting President Barack Obama - "quite a cool dude".
And, yes, it was sometimes hard being Prime Minister because "you always have to try to make good decisions and you can't please everybody. You get involved in some different and often difficult situations and you always have to try to do the right thing".
In several classrooms, Mr Key, with his easy, seemingly ingenuous, almost childlike affability, connects with the children in a way few adults can, say long-time teachers.
He is fascinated with the interactive whiteboards for which Owhata Primary is noted, uses one to draw a picture of the Beehive with an arrow pointing at his office, takes a genuine interest in the children's work and answers innumerable questions.
And, on Tuesday, he sent a message to the kids at Owhata Primary during his weekly appearance on TV One's Breakfast show, which he'd been asked, but hadn't promised, to do.
John Key is a Prime Minister whose like we have not seen. I've met many of our PMs over 50 years as a newspaperman - among them Holland, Holyoake, Marshall, Muldoon, Rowling, Clark - and none has had the easy, almost ingenuous, even childlike informality he displays.
Perhaps it's because he is not yet a seasoned politician.
Nearly all our Prime Ministers until now have served long apprenticeships as MPs and Cabinet ministers in the hothouse environment of power and have acquired that veneer of superiority, an aloofness, common to the political elite.
John Key is an enigma, for behind that friendly and smiling exterior there must lurk a needle-sharp mind and a spine of steel. You don't survive, let alone succeed hugely, in the vicious game of international finance without those attributes.
I have, over my career, watched a number of decent, honest blokes be corrupted by the foetid atmosphere of parliamentary politics - some even flagged it away - and it will be interesting to see just how long Mr Key can maintain his unaffected, ebullient, man-of-the-people mien.
Let's hope it's for many years to come, for it is as refreshing as a cold drink on a hot day. As one veteran schoolteacher observed: "He's the sort of bloke you'd have a beer with."
And when it comes to running the country, Mr Key is on notice to do it right. In a thank-you speech before the assembly at Owhata Primary, a senior pupil told him: "All the children at Owhata school will be watching the news in the future to see how you're looking after our country."