Gordon Ramsay earned a round of boos when he told a popular chat show host he was 'too scrawny' to fight.
Comedian Conan O'Brien had told the outspoken TV chef he found him 'intimidating' and that he had a 'fighter's intensity', asking why he often seems like he's ready to brawl.
'But you're too scrawny and thin, it wouldn't be fair!' said Ramsay, who was on the late night show to promote his new series of Kitchen Nightmares.
Come on then: Gordon Ramsay earned a round of boos when he told Conan O'Brien he was 'too scrawny' to fight, before giving in and arm wrestling him
The two then agreed to arm wrestle after the show, which airs on TBS.
Ramsay kept up his non-nonsense attitude when asked about a recent TV moment when he criticised an American Idol contestant's mother's cooking live on air.
'I'm sorry, I was just being honest,' he said. 'Bless her, it looked like a dog's dinner.
Where are your muscles? Ramsay said O'Brien was too thin
'I'm sure she's an amazing cook but I don't want to eat food that was made two or three days ago!'
The duo then had the audience in stitches during a frantic cooking segment, during which Ramsay said O'Brien was 'such a donkey'.
They then began jostling over their flames while making tacos and at one point Ramsay almost rugby tackled the comic.
Watch out! The duo then had the audience in stitches during a frantic cooking segment, during which Ramsay said O'Brien was 'such a donkey'Best of friends: The pair then began jostling over their flambé while making tacos and at one point Ramsay almost rugby tackled the comic
