Kieran Culkin has confessed. The star of “A Real Pain” and “Succession” admitted that he once swapped a prop joint for one spiked with real marijuana when he was cast in a stage production alongside Mark Ruffalo in 2000.

Kieran Culkin admitted that he once tricked Mark Ruffalo and other co-stars into getting stoned during a live theatrical performance. “I was 17 and stupid,” Culkin said in a recent interview with The Guardian.

Succession star Kieran Culkin recently opened up about getting actor Mark Ruffalo ‘high’ long ago as part of a prank, when they were filming a stage production together. This has sparked intrigue amongst fans who wish to learn the details about the same.

Kieran Culkin has revealed himself as the "naughty young actor" who was responsible for getting Mark Ruffalo and other co-stars high during a Broadway production of The Moment When. Ruffalo previously discussed the incident on The Graham Norton Show in 2012,

Kieran Culkin is coming clean about the prank he played on Mark Ruffalo 25 years ago. The A Real Pain actor, 42, revealed in a recent interview with The Guardian that he got the Poor Things star, 57,

With a stash of prop joints backstage, Culkin couldn’t resist the temptation to swap one out. “Uh-oh. I believe it’s happened,” he thought to himself weeks later as he caught a familiar scent and “just watched” Ruffalo take a hit before passing it to their co-star.

After Mark Ruffalo said a "naughty young actor" once got him high on stage when switching a prop joint for the real thing, Kieran Culkin came forward.

Kieran Culkin has come forward as the culprit who got Mark Ruffalo high during a performance of The Moment When more than two decades ago. “I was 17 and stupid,” Culkin, 42, admitted to the prank in an interview with The Guardian published on Saturday,

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