TYSON FURY tells a sick fan chanting the vile Ten German Bombers song: "Shut your mouth or I'll smack it in."
The Gypsy King lashed out at as he gave a press conference ahead of his fight against Tom Schwarz in Las Vegas this weekend.
Fury was holding court on stage when he invited his German opponent, 25, up to say a few words.
The former world heavyweight champion, 30, asks the crowd if they want to hear the pair sing a song.
While Schwarz is giving his answer, one voice can be heard singing, "There were ten German bombers in the air."
It is at this point that Fury turns round, points his finger in the direction of the perpetrator and threatens: "Shut your mouth or I'll smack it in."
Schwarz, perhaps not realising the significance of the song, laughs on stage.
Despite the grotesque chant, it was Fury who stole the show on the giant theatre inside the MGM Grand – by complimenting his opponent on his boyish good looks.
He even puckered up and pretended to plant a kiss on his undefeated rival, who he will fight next door at the MGM Grand Garden Arena on Saturday night.
Fury – who says he "nutted" brother Shane in a row over tickets for the fight – famously vowed to never set foot in Sin City before he was here to fight and he gets his wish at the weekend.
And, dressed in a suit emblazoned with pictures of bare-knuckle boxing champions, the Gypsy King took over the stage usually reserved for master magician David Copperfield.
During the promotion for what is the first fight on a megabucks 30-month deal with ESPN, he has hoped to cast a spell over the American boxing public.
Many have fallen in love with the story of his journey from suicidal thoughts to top of the bill here in Vegas.
Fury, who decided not to bother with a shirt under his custom-made suit, said: “I'm enjoying it, always, of course I am.
“When you look like this why can you not enjoy yourself?
"The crowd have warmed to me. American people are coming up to me in the street looking to talk and get pictures.
"I'm actually quite surprised. It is quite humbling.
"Here we are in Las Vegas, MGM Grand, all the big fights happen here, seeing your face up on all the movie screens around the Strip is incredible.
"The fight with Deontay Wilder helped with my profile in the US but now this is the biggest fight of my life.
“I got a good reception from the Las Vegas people. It has been fantastic.
“I'm here to put on a show and I'm the newest show in town. I'm the hottest show in town – literally.”
Fury remains on a crusade to raise awareness of the mental health problems which drove him to drink and drug abuse following his famous 2015 victory over Wladimir Klitschko.
He added: “I wanted to prove to people that there is a way back. I look to inspire people to better their lives. If I can do it then anyone can as I am just a normal bloke.
"Why am I in Las Vegas fighting? I want to help. I want to help people reach for something.
"I was down and out. Even my family thought I was finished but I dusted myself off and got back on the road.
"I have been heavyweight champion of the world, I've come back from nothing. Everything I do now is a bonus."
Tyson Fury takes on Tom Schwarz live on BT Sport Box Office this Saturday. For more information go to www.bt.com/btsportboxoffice
