TAB bookie Mark Stafford said the punter's loss was "hefty" and both the timing and weight of the bet were highly unusual.
"That's a hefty loss. We have more people betting, but don't tend to get those big bets anymore," Stafford said.
"I can't recall a bigger half-time bet than that. I would have been paying less than it would at kick-off because Wellington were leading.
"I always thought Harbour would win this game, I said so on TV last night."
It's not the only massive rugby bet which could end in tears today either.
One Kiwi punter has a hundred thousand reasons for the All Blacks to rewrite the record books tonight - and remain unbeaten for 2016.
A whopping $100,000 bet was slapped on the All Blacks at the start of the season - paying $1.50 - for the back-to-back world champions to not lose a game all year.
The All Blacks aim to set a new world record unbeaten streak of 18 straight wins at Eden Park tonight against the Wallabies. Then it's just the end of year tour which separates Steve Hansen's team from a clean sweep of 2016.
And for one man, that means fives games stand between him and a $150,000 payday - or a $100,000 loss.