Piers Morgan confessed things got a little "tense" in the studio as he filmed his stint on Who Wants to Be a Millionaire? with former enemy Jeremy Clarkson.
The Good Morning Britain host has spoken about his long-running spat with the ex Top Gear presenter which occurred around 16 years ago.
Jeremy is said to have punched Piers in the head three times, leading to him breaking a finger, The Mirror reports.
It sparked a feud which lasted for years before Piers said the enemies put things to rest by getting drunk together.
Now, Piers will take on the star's quiz show for charity, with it having been filmed ahead of it airing over Christmas.
Speaking about the moment the pair shared the studio, he teased all on them "making peace" and also the "banter" as Jeremy apparently showed his broken finger to him.
Piers told co-host Susanna Reid on GMB on Monday: "I'm now in the unnerving position to confirm I have taken part in Celebrity Who Wants to Be a Millionaire?
"For a Boxing Day special appropriately, given the host is somebody who once punched me three times in the head."
Susanna quipped: "[Someone who] you used to box with."
Piers went on: "It was as tense as you would imagine with Mr Clarkson and I."
Susanna then asked: "When was the last time you were in the same room together?" with Piers teasing all about them "making peace".
He explained: "We sort of kissed... we didn't kiss and make up, we bear hugged and had a big night out at my local pub, and drank ourselves to oblivion and declared peace after a 10-year feud.
"I've got to say it was a fascinating encounter, and it's fair to say the banter is off the charts as you can imagine.
"I think at one stage he shows me his gnarled finger he broke hitting my head...but it's good fun."
Good Morning Britain airs weekdays at 6am on ITV.
