Kieran Culkin admits to getting Mark Ruffalo high on stage during their Broadway run of The Moment W

Have you ever wondered what it's like backstage during a Broadway show? As a seasoned theater enthusiast, I can tell you that I've seen my fair share of memorable moments. But nothing quite compares to the hilarious prank Kieran Culkin played on Mark Ruffalo during their run of "The Moment When."