If you have a volatile enough a persona, this might make the judges score in your favor. But the only person I can think of who'd actually make people wonder is Tyson.
It's difficult to tell by his body language, but there are little signs that he's not being serious. When he's joking I pick up on the way he emphazises that sentence or how one of his eyes might twice or the half smile on one side of his mouth. They are very subtle and if you don't like him to start with then they are easy to miss as the stuff he comes out with just help to re-enforce your opinion of him.
froch in his earlier interviews was classic on the bbc for brit viewers some should remember lines like "im the best althlete in briton pound 4 pound sport 4 sport" (CLASSIC) "why do ppl always get behind losers like england football team' damon hill and tim henman an hate on a winner like me wen i produce the goods for this country and you have ppl like david beckham who in my opinion is underworked overpaid an overpraised he is'nt fit enough to carry my kit bag" (all said whilst he was british & commonwealth champion) "tiger tim henman (tennis player) needs to retire hes never gonna win anything hes swallowed more times than bernard manning in a pie eating contest" (after ko'ing damon hague in 1 round) "oh yeeer i hit him right on the back of the tab there thats a nasty shot that is very dangerous shot that wuda took anybody down" all whilst doing that straight faced blue eyed icey glare as he sniffles wiv dat swagger look as if to say yeh im the man. Also i remember i line wen he used to talk more street an be into the hiphop stuff an like hes down with the brothers hence his interview bout hanging wiv lots of deprived black kids growing up 4 the wigger eminem slim shady lifestyle. he goes "yeh im from nottingham known as shottingham to some" (for the street cred appeal) he had more which i cant remember but if u google carl froch interviews from 2002 to say 2006 youl get some real 1 liners hence he has picked up haters over the years as lots didnt get his dry hmour like jimmy carr as his face stays dead straight
The majority of what Froch says is tongue in cheek and as others have pointed out he lets out hints every now and then while he's doing it. TBH even if he was dead serious I think he'd be even funnier. 'I'm gonna smoke his boots'
"I just love an old fashioned tear up, but to speak the truth Robin Reid was far removed from his best when he fought me, but hey.. I knocked on JCs door and he relinquished the title to fight a 44 year old man... so there you go" Shows you Carl is just a very confident, yet humble man. He's a warrior, and I would hope the Danes greet him nicely in Herning tonight.
"I'm a ruthless, cold-hearted, selfish person, most boxers are," said Froch. "You have to be selfish. You have to say 'no' to friends and family. You have to be disciplined and you become somewhat of a recluse, especially when you're training. Now, I'm not just doing it for myself but I'm doing it for my son Rocco as well. He's too young to understand it now but someday, when's he's old enough, he can look back on this fight and watch it on video and he can be proud of his old man. I miss him when I'm training but I don't pine for him". "Me and Mikkel have Round 13 to continue from where we left off. After I'd punched his face in, I thought "He's finished now" - but he's adamant he's coming back, so big respect to him". Dirrell: "I’m just ready to do anything for a world title. If that means I have to go over to Nottingham to pick up a world title, then that’s what I have to do. Regardless, I think this is going to be easy as pie." Froch: "Nottingham is not too far a distance. I think hell and back is more like it."