KSI had to tell Kate Garraway to "calm down" while punching Richard Madeley during a fun appearance on Good Morning Britain.
The social media star is promoting his upcoming fight with Tommy Fury, with the duo set to appear at a Wembley Arena press conference later today.
KSI began his promotional day by joining Garraway and Madeley on the GMB sofa.
The 30-year-old initially sat down to discuss his global fame, appeal to young people and how he keeps his private life under wraps.
He then stood up to give Garraway a punching demonstration, much to the 56-year-old's delight.
KSI helped Madeley attach pads to his hands before Garraway, whose excited 14-year-old son William was watching on, started throwing windmill punches towards Madeley.
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As the 67-year-old held his hand out, Garraway threw her weight behind a right hook.
A delighted KSI laughed as he exclaimed "calm down!"
He then shouted: "You're going to knock his head off!"
Garraway asked: "Me or Tommy Fury?"
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KSI surprisingly didn't take the opportunity to mock his upcoming opponent, however, saying the former Love Islander was the better puncher.
YouTuber KSI had already touched on his bout with Fury, saying: "This is a proper fight. Me and him are going at it."
He also commented on the extraordinary demand for his range of Prime drinks launched with Logan Paul.
Asked if the shortages of Prime upon its launch were a marketing ploy, he revealed: "I wish! We tried to make enough but the demand was just too high."
Paul, 28, is also set to be on the October 14 card at AO Arena in Manchester.
The WWE star is set to fight Dillon Danis, who previously pulled out of a scheduled bout with KSI.