In years to come those amongst the lucky 38,000 will simply say "I was there."
There is, of course, more to say, more to remember.
Such as how a horse like Winx, no that is wrong - there is no horse like Winx. There is just Winx.
Such as Winx taking away the great uncertainty of racing.
Usually none of us know in advance how a race will pan out, if the favourite will run into trouble, if a longshot will run the race of a lifetime.
But Winx is beyond bad luck. The dazzling sectionals she is capable of recording make it impossible for her rivals to box her in. The 2018 W.S Cox Plate was decided before it began.
Will to win is a trait admired above all else in the thoroughbred. Winx, of course, has it in spades. We saw it in the Turnbull Stakes as we had seen it so often before - those thrilling moments when, for one brief moment, it looked as though her streak was about to come to an end.
Such as in the 2017 W.S Cox Plate when Humidor made a gallant but futile attempt to catch her.
Some say laying in cost him - but the challenge of chasing Winx is what placed him under such pressure. She was just toying with him.
"If the race had been longer would the result have been any different?" one scribe asked Humidor's trainer Darren Weir.
"She would've won by more," he replied.
Racing as well as he was 12 months ago when he tried to match Winx, Humidor was 4 3/4 lengths astern of her on Saturday.
The winner of eight races, just under $4 million in stakes; winner of three feature weight-for-age contests.
Could not match Winx.
Winx won her fourth W.S Cox Plate by two lengths in 2.3.47. Not her biggest margin in the race, not her fastest time. Not her biggest number of rivals. By no means the strongest edition of Australia's biggest weight-for-age contest. But history doesn't really care about any of that, nor do those who will forever say...
"I was there."
Trainers are at the track so often that very few go to the races on their rare days off. But there they were at Moonee Valley, seen lining the parade ring fence as she cooled down, so quickly shaking off the rigours of victory.
Some not known for sentimentality were seen taking selfies as she strolled by. Others admiring her athleticism, her presence.
Jockeys hung around too.
Mostly they, along with the other Winx fans present, were silent. Awe was a way to show respect though there was another... once she had enjoyed her post race shower those present applauded.
Vin Lowe worked at Moonee Valley for 35 years. He has witnessed 46 consecutive runnings of the W.S Cox Plate; from Taj Rossi on. He has "never seen anything like this;" so much clapping.
The crowd clapped as Winx came out through the tunnel and onto the track. Under a sea of blue hats they were still on a high having drowned out Daryl Braithwaite belting out The Horses. Every vantage spot was taken and not just within the track - each fence with a viewpoint from outside the racecourse was crammed with people.
They clapped her back to scale as blue streamers shot across the course. There was no need for anyone to rise to their feet, they had already done that as Hugh Bowman made his run from before the turn.
Roaring as they did so.
An "I was there" moment.
They clapped her as they vainly tried to put what they had just seen into words. Though there were more dabbing the tears out of their eyes than there were talking.
They clapped her as she cooled down, they clapped her as she left her box, as she left the track. I'd say many a fan was clapping in their sleep on Saturday night.
A night which was late for many, thousands remaining on track for hours after the last race had been run and won. It was the same last year, a day so big, so thrilling, that those on course just did not want it to end.
A television journalist who normally covers other sports was there for the day, marvelling that "today we presented six hours focused on just one athlete... that is unheard of."
Bryan Martin called many great Cox Plates. He was seen just after the race shaking his head... "amazing" is all he could say.
Though he had more to add 24 hours later - "I saw my first Cox Plate as a teen in 1967 when Tobin Bronze bolted in; I was on the flat on that amazing day. Since then - well you know the roll call, but nothing equals yesterday. If I never see another Cox Plate it won't matter."
American racing fan Lisa Bressler made her first trip to Australia just to see Winx and she enjoyed every moment of Cox Plate Day.
"There was so much to absorb, the atmosphere was electric with excitement building over the course throughout the day. The sound of the crowd was something I have never experienced before, especially as Winx took the lead - that prolonged roar across the course."
"And it continued as Hugh Bowman took her down the course to acknowledge the adoration; that was an emotional and awe inspiring experience."
Lisa will look back at this day for years and think...
"I was there."
Winx's trainer Chris Waller could hardly speak, everyone understanding of the croakiness of his voice, the tears in his eyes. "We are not trained to deal with this," he said. "I can't say much, I'm gassed, the horse has more petrol than me."
Later that night Waller and his wife Stephanie are at Melbourne airport preparing to head home. They spy five-year-old Jude Hudson donned in Winx's colours. He had been awake since 2am for a 6am flight, so keen was he to see his equine hero. He had a bit of sleep to catch up on at the track but come Cox Plate time was wide awake.
Over came Chris Waller with his trophy, the Hudson family pose for photos. What a thrill says Jude's father Adam - "he must've been exhausted, what a champion bloke, so good with his time. It made my son's day."
Putting a sealer on little Jude's big day, one he will be thinking about for years to come...
"I was there."
Whilst being so adored, so applauded, Winx remained unperturbed.
Relaxed before the race, relaxed afterwards. For just one brief moment did she express some displeasure... when the handsome Benbatl stood for few seconds in front of her to pose for cameras. She gave a swish of her tail, a little stamp of her feet - as if to say "this is my moment, not yours."
Winx was calm during the race too, travelling so sweetly for Hugh Bowman. Those closest to her did not find the 2040 metres so easy. Devoted strapper Umut Odemislioglu found it hard to watch, looking away at times, once placing his face on his folded arms; anguished. Sensory overload.
Track rider Ben Cadden stood almost stock-still. Serious. Concentrated.
But when Winx, with such ridiculous ease, so quickly put the race away he raised his arms into the air. A moment he'd like to put the pause button on. He has ridden over a hundred Group One horses but none like this girl. He knows how special this is.
"It has been a blur, a dream I don't want to wake up from," he said, already dreading the future - "life is going to be empty without her!"
Though there will eventually be another generation to follow; "how cool would it be?" Cadden asked, "if Umut and I could be there at her first foaling!"
Cadden grew up with the legend that was Kingston Town. He watched videos, listened to stories told by Tommy Smith's foreman Spider Barker.
To equal that horse's W.S Cox Plate record was one thing, to better it... "it is a little surreal."
Winx is, Cadden said "no longer simply a champion. She is an immortal."
One who has a unique milestone awaiting as no horse has ever been crowned Australian Horse Of The Year four times. Which of course is going to happen. And the day she put a seal on that honour was a day witnessed live by over 38000.
All of whom are saying.
I was there.
Story by Kristen Manning (who was there!)