Matt Damon explains how Ben Affleck saved him from getting beat up in high school

Matt Damon joined Conan Monday night where he remembered the last fight he’d been in, and how his longtime friend Ben Affleck came to the rescue. In fact, according to Damon, it was that a day that sparked their decades-long friendship. As Damon explained, it was a snow day in the mid ’80s and the neighborhood kids gathered for a game of snow football. Damon ran his mouth a bit too much to the wrong kid and found himself in a bad situation.

“I mouthed off to this kid that I knew, but he was like your [Conan’s] height, like 6-foot-6, and I might have been 5-3 at the time, and I said something,” Damon said. “I’d scored on him or something, and I don’t know, I said something but he came for me. And it was like this mountain of a guy came at me and I was like, ‘Oh man.’ So before I knew it, it was like I was on the ground, he was above me, and I was like, ‘This is gonna be bad.’”

Lucky for Damon, Affleck had that superhero instinct long before he became Batman.

“It was right then that little 5-foot-2 Ben Affleck tackled this dude off of me, like out of nowhere,” Damon said. “I was, like, a junior and he was, like, a freshman, and he tackled this kid off of me, literally at the risk of his own life.”

And that was the moment Damon knew Affleck would be a good friend.

“But I remember that was a big moment,” Damon said, “going like, ‘This guy, he will put himself in a really bad spot for me.’ Like, ‘This is a good friend to have.’”

Conan airs weeknights at 11 p.m. on TBS.

Check out why these young singers moved Taylor Swift to tears on The Voice:

Read more from Yahoo Entertainment:

• ‘DWTS’ judges ‘irritated’ by Sean Spicer not being eliminated despite low scores

• John Oliver actually agrees with Trump on something: ‘Just absolutely right’

• Al Pacino reveals origin of iconic catchphrase from Oscar-winning performance

Tell us what you think! Hit us up on Twitter, Facebook, or Instagram, or leave your comments below. And check out our host, Kylie Mar, on Twitter, Facebook, or Instagram.

Want daily pop culture news delivered to your inbox? Sign up here for Yahoo Entertainment & Lifestyle's newsletter.