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

Mark Ruffalo revealed how he handled being pranked by Kieran Culkin - who swapped a prop joint for a real one - on the opening night of a play in 2000.

Succession’ star revealed that he switched prop joints for the real thing while starring in an off-Broadway production when he was 17

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

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.

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.

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 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 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.

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,