Kieran Culkin Confesses He's The Actor Who Pranked Mark Ruffalo, Got Him High On Stage

Kieran Culkin got Mark Ruffalo high on stage over 20 years ago!

The 42-year-old A Real Pain star recently confessed publicly to a prank he played on his former co-star when they starred in a production of the play The Moment When together in 2000.

Previously, Mark revealed a “naughty young actor” got him high on stage during one night after they switched a prop joint for a real one, and now Kieran has come forward with being responsible.

Keep reading to find out more…