UFC media day, MGM Grand, 2014. Jon Jones pressed his forehead into Daniel Cormier's at the staredown. Cormier shoved him.

Punches flew and both men tumbled off the stage in front of the cameras.

UFC London, 2019. Minutes after knocking out Darren Till, Jorge Masvidal was doing an interview backstage when Leon Edwards walked past and said something.

Masvidal attacked him on camera. Asked about it, he said he gave Edwards "the three piece and the soda".

Brooklyn, 2018, UFC 223 media day. After Khabib Nurmagomedov confronted McGregor's teammate at a hotel, McGregor showed up at the arena with a group of friends.

He threw a metal hand truck through the window of the bus Khabib was on. Flying glass injured two fighters, who were pulled from the card.

Seconds after choking out Conor McGregor, Khabib Nurmagomedov threw his mouthguard down, climbed over the cage and dived into the crowd at McGregor's teammate.

At the same moment, members of Khabib's team jumped into the Octagon and punched McGregor. The arena erupted.