Canelo Alvarez interrupted a presenter during a press conference after hearing an awkward UFC comment.
The Mexican superstar is set to defend his undisputed super-middleweight title on Saturday in Las Vegas against Terence Crawford, who has moved up two full weight classes for the bout.
Victory for American Crawford would see him become the first male boxer in the modern era to be undisputed across three divisions.
With so much on the line, excitement has been building within the boxing world and the pre-fight press conference only intensified those feelings.
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While promoter Dana White found himself in a tense exchange with a reporter, Alvarez interrupted American boxing commentator Max Kellerman.
Kellerman had been praising White as one of the greatest combat sports promoters in history, pointing to the growth of UFC as an example of his influence.
He then explained how he thought White could continue to expand boxing.
At that stage, Alvarez interjected, making his opinion clear, as you can see in the clip above.
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The 35-year-old said: "UFC is not bigger than boxing."
Although most sports fans would agree, it was a bold statement from Alvarez with UFC President White stood in the background.
However, White has expanded into boxing promotion in recent years, having worked to promote UFC icon Conor McGregor's fight with Floyd Mayweather back in 2017.
How big is the Canelo Alvarez vs Terence Crawford fight?
Saturday night's bout could be one of the most-watched fights in history.
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It will be available at no extra cost to more than 300 million Netflix subscribers worldwide, making it accessible for fans around the world.
But for fans within the UK, the timing presents a challenge, with ring walks expected for between 04:00 and 04:30am.
Despite the bout happening in the early hours, many fans are expected to tune in to watch Alvarez put his undisputed crown at 168lb on the line.
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It means the WBA, WBC, IBF and WBO titles are all on the line.
With both men nearing the end of their careers, it is a potentially legacy-defining fight.
The high stakes and global attention have put White and Saudi Arabian sports promoter Turki al-Sheikh at the centre of the event.
The pair recently co-founded Zuffa Boxing, and the fight at the Allegiant Stadium in Las Vegas is the company's first event.
Topics: Canelo Alvarez, Boxing, UFC, Dana White, Boxing News
James Taylor