Culkin and Ruffalo shared the stage in Playwright Horizons' 2000 production of James Lapine's "The Moment When."

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 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,

Kieran Culkin opened up about getting Mark Ruffalo, 57, high while they were in a play together by swapping a prop joint for real-life marijuana.

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 admitted that he once swapped a prop joint for a real one while acting in a play alongside Mark Ruffalo earlier in his career.

In a new interview with The Guardian, Kieran Culkin makes a point of saying that he doesn’t do drugs and never has—with one pretty major exception. In 2000, Culkin performed in The Moment When, an off-Broadway play written by James Lapine.

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,