In a brilliant bounce back after two howlers in New Zealand, the Waratahs conjured a try-of-the-season contender before defending their line with 14 men for some 28 phases after the fulltime siren to hang on bravely on Friday night.
"That's a special one. That'll be up there," said stand-in captain Hugh Sinclair, deputising for the injured Jake Gordon.
"That crowd was immense, especially in that last passage of play. Got their money's worth.
"Yeah, just stoked to get the win after a tough couple of weeks."
The boilover at their Allianz Stadium fortress was the Tahs' fifth win in an unbeaten run in Sydney this campaign and thrust Dan McKellar's side to fourth on the ladder.
And the famous victory was nothing but deserved after the Waratahs endured a series of dubious calls late in the first half that might have derailed a side of less resilience.
In a team of heroes intent on answering McKellar's demand to respond after leaking 16 tries and 102 points in back-to-back defeats to the Hurricanes and Moana Pasifika, inspirational centre Joey Walton and code-crossing superstar Joseph-Aukuso Suaalii at fullback were stand-outs.
Walton was in everything in attack and defence, while Suaalii was integral to all three of NSW's tries as the Waratahs snapped an eight-match, eight-year losing streak against the Chiefs.
The Waratahs' defensive will and pressure reduced Chiefs and All Blacks pin-up Damien McKenzie to a fumbling nervous wreck.
"I let our team down tonight," the fullback said.
"Just not good enough by my standards and, when you do that against a good team like the Tahs, particularly at home, they're going to put you under pressure.
"So extremely disappointed with my performance."
The Waratahs had every right to feel aggrieved at not being 21-0 up at halftime, or at least 19-0, instead of only 14-7 after being on the wrong end of a succession of contentious decisions.
With NSW leading 14-0, the television match official overturned a try to Lalakai Foketi in the 27th minute after ruling the airborne centre planted the ball simultaneously on the tryline and sideline.
Two minutes later, the Chiefs bagged their first try down the other end to winger Leroy Carter off a suspected forward pass.
Rubbing salt into the wound, Chiefs centre Gideon Wrampling was most fortunate to only receive a yellow card rather than a straight red after rising high to plough his shoulder into Suaalii's head in the shadows of halftime.
The Tahs had to settled for a tenuous seven-point buffer at the break after a solo effort from Suaalii, who beat four defenders to touch down, and a well-worked try to winger Triston Reilly.
To the delight of the delirious crowd, the home team restored their 14-point advantage four minutes into the second half with a rousing length-of-the-field effort.
After defending their own line stoutly, the Waratahs converted a desperate turnover into a 102-metre special - started and finished by halfback Teddy Wilson after the ball travelled through five sets of hands.
Wilson released Kellaway from the turnover before the winger sped 35 metres downfield and put Suaalii away inside the right touch line.
Suaalii's infield pass was majestically - and blindly - tapped on by flyhalf Lawson Creighton back to the supporting Kellaway, who put Wilson over.
The incredible strike ultimately proved the difference after flanker Samipeni Finau crashed over to reduce the deficit to seven points as, even with replacement lock Miles Amatosero in the bin for the closing stages, the Chiefs couldn't force golden-point super time.
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