Mr Key's smile, however, was undimmed.
"People have a right to protest and in my time as Prime Minister I get a fair few protests, that's just the nature of democracy."
Back down the road in Paraparaumu, Mr Key was to open the refurbished Coastlands cinema but the site, like list MP Hekia Parata's claim on the Mana electorate, was a work in progress.
While she lost to Labour newcomer Kris Faafoi in the byelection late last year, she slashed Labour's majority from 6155 to 1080 and will be hoping for better in November.
Meanwhile, Mr Guy will be looking to consolidate his hold on the Otaki electorate he wrestled from Labour's Darren Hughes in 2008 with a somewhat slender 1354 vote majority.
So was this early campaigning in key electorates?
"Not really," Mr Key said, "but truthfully, we're 97 days from an election so we try and reach out and go to different communities. I pretty much do that every week anyway whether there's an election or not."
But Mr Key did indicate he and his party would be working to win votes over coming weeks despite the Rugby World Cup dominating public interest.
The five weeks between the end of the tournament and the election was not a lot of time "to get out there and sell our messages".