By Derek Lawrence
Updated November 04, 2016 at 11:52 PM EDT

Before he was working construction with Will Hunting, sneaking hostages out of Iran, or saving Gotham, Ben Affleck was teaching science to sixth-graders.

Appearing on The Graham Norton Show, The Accountant star was forced to relive his career as a child actor and TV host, where he was once the star of PBS’ The Voyage of the Mimi, a series aimed at teaching middle schoolers about science and math. On the show, Affleck would speak to experts about topics that he now says he didn’t even understand.

“It was totally beyond me, I had no idea,” he admitted. “They worked me to the bone, so I was half asleep all the time. They’d get to my reaction shots at the end of the day and I’d be going… [bobbing his head]”

That made sense to Norton, who determined Affleck’s lack of sleep might explain his “unengaged listening face,” which was highlighted in a montage of the young actor looking uninterested while professionals explained various scientific subjects to him.

“I still use that face,” joked Affleck. “That look is all over Pearl Harbor.”

Watch the video above.

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