More than 40 years after their hit film The Outsiders hit theaters, Rob Lowe is sharing a unique story about how he spent his downtime on the set with Tom Cruise.

Both The Outsiders and another 1983 classic – Risky Business – help put Cruise, 62, on the map after his first roles in 1981’s Endless Love and Taps and 1982’s Losin’ It.

Lowe made his feature film debut in The Outsiders after a handful of TV roles, and they were joined by a slew of future stars like Emilio Estevez, Matt Dillon, Patrick Swayze, Ralph Macchio, Diane Lane and C. Thomas Howell.

Lowe, 60, appeared on The Rich Eisen Show on Monday and was asked if he had a good Tom Cruise story for him.

The actor revealed that Cruise was ‘so competitive’ and shared how he once knocked him out while sparring at their hotel.

More than 40 years after their hit film The Outsiders hit theaters, Rob Lowe is sharing a unique story about how he spent his downtime on the set with Tom Cruise

The actor revealed that Cruise was ‘so competitive’ and shared how he once knocked him out while sparring at their hotel

‘We used to box in the hallway of the hotel we were staying at during Outsiders,’ Lowe revealed.

He admitted there was, ‘so much testosterone,’ because they were, ’18-year-old guys stuck on location.’

He added that they would, ‘wear headgear’ and mouthpieces for these sparring sessions, but they were fighting for real.

‘We would legitimately spar. And I just remember… Tom is jacked. I’m like a pipe cleaner arm. I hadn’t started working out yet so I look like Karen Carpenter. I am not jacked,’ Lowe joked.

‘And Tom is like this beast, but I hit him real clean and I rang his bell. The next thing I knew I woke up… I was coming to on the floor. He like completely knocked me out,’ Lowe shared.

‘Because I hit him… hard, and his eyes just went black, but that’s the stuff we did. That’s the kind of… that’s what guys do, it’s like Fight Club.’

When asked when he first met Cruise, Lowe shared, ‘I was 17 and I think Tom’s a year older than me, so he was just 18, and he was living at Emilio’s (Estevez) house, auditioning, right after Taps,’ which Lowe said was a, ‘great movie.’

He was shown a photo of the cast of The Outsiders, with most of them laughing and smiling, as he explained how that particular photo came to be.

‘We used to box in the hallway of the hotel we were staying at during Outsiders,’ Lowe revealed

He added that they would, ‘wear headgear’ and mouthpieces for these sparring sessions, but they were fighting for real

‘We were supposed to be looking tough and cool. We shot for an hour, tough cool, tough cool, tough cool, and they brought in food just off camera,’ Lowe explained.

‘There were a lot of local kids who would come into this little place were were shooting and steal the food,’ Lowe continued.

‘Leif Garrett was standing near them and there was announcement that the food is for the talent only, and Ralph Macchio says, “Yeah Leif, the food is for the talent only,”‘ Lowe said.

‘And we all laughed and that’s the photo. That’s the photo after that happened. It’s the only smiling photo we took,’ Lowe explained.