UFC light heavyweight champion Jon Jones and challenger Daniel Cormier entered into a brawl at a media event at the MGM Grand lobby in Las Vegas on Monday. After featherweights Conor McGregor and Dustin Poirier engaged in an intense staredown of their own, the main event big boys came out, with the champ proudly holding his belt. After the pair locked foreheads, Cormier pushed Jones away, which caused Jones to dump his belt and head towards Cormier with some serious intentions. Check out what happenend.

Pretty intense, eh, and the war of words kicked off on Twitter afterwards. From Jones:

Cormier had some words of his own, and wasn’t shy to share his opinion of events:

UFC 178 just kicked up a notch, folks! UFC President Dana White’s reaction was priceless:

Editor’s Note: Notice how much the UFC Sr. Director of Public Relations Dave Sholler enjoyed the McGregor/Poirier staredown. Little did he know what he would be involved in next! Here is another angle:

Check out the two men making good (sort of, not really) on ESPN after the event: