Rob Lowe recalled duking it out with his pal and former co-star Tom Cruise when they were just teens on the set of the 1983 film The Outsiders.

During Mondays episode of The Rich Eisen Show , the actor, 60, took a stroll down memory lane after host Eisen asked him to recall a story about working with the action star.

Hes so competitive that we used to box in the hallway of the hotel we were staying during Outsiders, Lowe recalled of Cruise. So much testosterone. Were 18-year-old guys stuck on location. So we would wear headgear and wed have mouthpieces in, but we would legitimately spar.

In the coming-of-age film, Lowe played compassionate teen Sodapop Curtis while Cruse, now 62, starred as cocky car lover Steve Randle.

Lowe said he wasnt working out at the time and had pipe cleaner arms and that Cruise was jacked in comparison.

Tom is like, this beast, he said. But I hit him real clean and I rang his bell. And the next thing I knew, I woke up and I was coming to on the floor. Hed, like, completely knocked me out.