Deontay Wilder and Tyson Fury's latest media conference again descended into a ruckus as the two exchanged verbal blows in Los Angeles.
The build-up to the December 1 bout has been heated and a previous media engagement also became physical.
American Wilder will be defending his WBC belt at the Staples Center against a man who once held the IBF, WBO, IBO and WBA titles.
As the two squared up, Fury told his rival: "Your breath stinks. Brush your teeth, mate, brush your teeth."
They spoke over one another before a shove saw them separated as a number of people ran onto the stage to keep them apart.
After another insult from Fury, Wilder went for him but was held back, with the Briton goading: "Any time of day, seven days a week, twice on Sunday.
"He needs all his men, I don't need nobody.
"I came to America on my own, I stand my ground against any man born from his mother."
With the conference halted at that point, a calmer Wilder suggested afterwards that he was getting irked by Fury and compatriot Anthony Joshua.
"These Brits have been giving me hell the past couple of months," he said.
"One of them doesn't want to fight, the other one is here doing his thing, it's all about the promotion. But we’re still fighters. Who on stage is going to be able to hold two big fighters back? If I want to, I’m going to get you. But then you jeopardise the fight, and I don't want that.
“I definitely think I’m the No. 1 heavyweight in the world. I wouldn’t be here if I didn’t feel I was the best. I’m not worried about any other fighters or what they’re saying or how they are hyping themselves up. I already know I’m the part. All you have to do is tune in. I’m about to put him in the oven and make a muffin.”