Everybody knew that the tensions between Conor McGregor and Khabib Nurmagomedov were high going into their UFC Lightweight title fight but few could have predicted what happened.
The build-up to this fight started with chaos as McGregor infamously attacked a UFC team bus with Khabib on board, facing criminal charges in the process.
While the violent attacks may have ceased after that, the verbal ones didn't and Khabib's assertion that there would be no handshake after the fight came as no surprise to anyone.
The fight in Las Vegas ended in round four as Khabib submitted McGregor, retaining his UFC Lightweight title as well as his undefeated MMA record.
It's an enormous victory in what was promoted as 'the biggest fight in UFC history' and yet it's what happened afterwards that has demanded everyone's attention.
Having just defeated McGregor, Khabib was seen pointing at the Irishman's team before climbing over the top of the Octagon and attacking them.
As the Russian fought outside in the crowd, McGregor was confronted by members of Khabib's entourage where another fight broke out.
And so the fight that had started with the chaos of McGregor's bus attack ended with a mass brawl between the two teams - and one man who is no stranger to that kind of controversy feels it's right up there with the worst he's seen.
Mike Tyson was watching the fight and tweeted out his feelings as everything went down in the aftermath.
"Watching the [McGregor] v [Khabib] fight," he said. "Unimaginable. Never thought it would go down like this.
"Crazier than my fight riot."
That's quite a statement from a man who twice had high-profile post-fight brawls in his career.
Tyson saw controversy following bouts with Donovan Ruddock in 1991 as well as after infamously biting Evander Holyfield's ear in 1997.
He's right though - even the highly controversial Tyson has never been involved in something quite like Las Vegas saw on Saturday night.
This certainly won't be the last we've heard of McGregor v Khabib.