WATCH: ‘Succession’ star Kieran Culkin admits he committed a faux pass the first time he was on ‘SNL’

Kieran Culkin attends the "Succession" European Premiere during the 65th BFI London Film Festival at The Royal Festival Hall on October 15, 2021 in London, England
Photo credit Getty Images

Last night was the first time Kieran Culkin hosted “Saturday Night Live.” But it wasn’t the first time he was on the show.

And from what happened that first time, Culkin might've been a little nervous to return.

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On Thursday, Culkin sat down with Jimmy Fallon on “The Tonight Show” and told the tale of a clumsy kid move he pulled at "SNL" way back.

In 1991, Kieran’s older brother, Macaulay Culkin, was doing the hosting duties, fresh off the huge success of the first "Home Alone" movie. And Kieran, only 9 at the time, was tabbed to appear in a few sketches with his brother, as Yahoo News reported.

"I remember, during rehearsal day, being on the stage, and I was with my mom,” said Culkin. “Kevin Nealon walks by, and she grabs him and she goes, 'Oh, hey, you're great. By the way, you're my son's favorite.’” The genial Nealon accepted the compliment in stride.

But in a bit of brazen backtalk -- not unlike the kind his current “Succession” character, Roman Roy, might spew -- the little Culkin turned to mom and said, "Mom, I told you he's my second favorite. Dana Carvey is my favorite!”

"I remember actually seeing him take this little tiny dagger and go... 'Well, still very nice to meet you,'" Culkin added.

All was soon forgiven and forgotten, as during the traditional cast-on-stage closing credits roll, Nealon picked up Kieran and held him in his arms.

Culkin turned the tables and asked Fallon a few questions about what it’s like to host "SNL" after also appearing on it. “I was so green and learning when I was in the cast,” Fallon said. “And hosting was like going back to school.”

By all accounts, Culkin’s return to class last night went off without any backstage cast member embarrassments.

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Featured Image Photo Credit: Getty Images