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.

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Kieran Culkin recalled how he swapped a prop joint with real marijuana while pulling his prank on Mark Ruffalo

The "very naughty young actor" responsible for getting Mark Ruffalo and others high on stage during an off-Broadway play has finally revealed himself. Kieran Culkin copped to the prank, which he blames on being "17 and stupid,

Kieran Culkin has admitted he's the "naughty young actor" who once got Mark Ruffalo high during a play by replacing a prop joint with a real one.

Kieran Culkin has confessed to a prank that left Mark Ruffalo and others high during an off-Broadway play in 2000. The actor swapped a fake joint with a real one, leading to an unexpected on-stage experience.

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.

Kieran Culkin has admitted to getting Mark Ruffalo high during a play. The Succession star has revealed that he once got the Marvel star high during a 2000 Broadway performance of The Moment When when he was a teenager.