Dave Grohl brought his mom, Virginia, on The Late Show With Stephen Colbert to promote her new book, From Cradle to Stage: Stories From the Mothers Who Rocked and Raised Rock Stars. Meanwhile, Virginia brought some embarrassing things from Dave’s childhood.

First, Colbert showed an adorable photo of Dave when he was a child, and then he revealed the star’s report card from sixth grade. “That was a tough one,” Dave’s mom said. “That was a tough year.” Colbert then started to read the notes on the report card — “Respects authority: Needs improvement. Is courteous: Needs improvement. Accepts responsibility: Unsatisfactory.”

The list continued with everything followed by “needs improvement” or “unsatisfactory.” Dave explained that he wasn’t always a bad student, saying, “I have to be honest. I was kicking ass up to first grade, and it was all downhill from there.”

The Late Show With Stephen Colbert airs weeknights at 11:35 p.m. on CBS.

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