On a day when the batsmen dominated proceedings, 17-year-old Southland Boys' High School pupil Jacob Duffy made bowling look easy with a sensational debut.
The right-armer took three quick wickets, including a double-wicket maiden, to help Otago seize the early momentum. Ian Butler also made a good return with none for 28 from his four overs.
Hamish Marshall led Northern's recovery with his wonderful undefeated innings of 86 from 45, and experienced campaigner Scott Styris treated the bowling with contempt, savaging 45 runs from 24 deliveries.
The pair combined in a 93-run stand for the fifth-wicket and Peter McGlashan chipped in with a hard-hit 22 from just nine deliveries.
Styris, who was wearing a microphone, actually announced the moment he planned to tee off. But while he was the bully one minute, muscling the ball over midwicket, he was every bit the batsman the next, drawing on a wide array of proper cricket shots to whack four sixes and two fours.
Marshall was even more impressive. He moved effortlessly into the 40s but was over-shadowed by Styris for hitting power until the 17th over, when he dispatched Nathan McCullum for 27 - three consecutive sixes, followed by a couple of boundaries and, mercifully, a single from the last delivery.
Marshall, though, should have been dismissed for 23. Nick Beard dropped a simple caught and bowled opportunity.
But the day belonged to Brendon McCullum. His undefeated 103 from 54 was another reminder of why many consider him to be the best Twenty20 batsman in world cricket.
Watching him swivel into a pull shot is one of the greatest joys in life unless you happen to be the unfortunate bowler. Hopefully, he can take that form into the test against Zimbabwe in Napier next week.