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During 12 years of attempting to solve Britain's most bizarre domestic disputes - it's fair to say Jeremy Kyle has encountered some lively characters on TV.
But this father with just four teeth may have become the show's most outrageous guest ever after an appearance that included him lashing out at multiple audience members and threatening to stamp on the presenter's face.
Tempers initially flared when Mark, from Leeds, accused an audience member of staring at him, before saying 'Muppet - I'll take your girl from you.'
This sparked howls of laughter and derision from the audience, which only increased when the spectator retorted: 'With your teeth? Are you having a laugh?'
He then proceeded to call Kyle 'a big-nosed c***' and added: 'I'll squash your nose with the bottom of my shoe' as the presenter was flanked by two burly security guards.
When Kyle said 'I'm surprised you can even make a woman pregnant, looking at you', the guest got up and made a move towards him, but quickly returned to his seat.
Mark had appeared on the show attempting to deny that he was the father of his ex girlfriend Amanda's baby boy, Kai.
He had also tried to taunt her from backstage before he had been brought out, asking: 'Are you mad? Are you mad?'
She told the show that he had already forced her to get one abortion, but when she fell pregnant again he left her and said he wished she would die in childbirth.
He ended up storming off the set when the audience had further mocked him after he tried to brag about his charm on women.
Not even bothering to stay out for the DNA result, the production team were told by the guest they would have to bring it to him backstage:
'That's what you get paid to do. Get your little legs running, come on,' he said.
But his appearance on the ITV show was cut short after he aimed further insults at Kyle and threatened to 'get hold of him.'
He said: 'You're a muppet, Jeremy. You always will be, mate. I might not have no teeth but I know how to talk to people, you clown.'
After being escorted off set, it was revealed that Mark was in fact Kai's biological father.