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.

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

Kieran Culkin has revealed himself as the "naughty young actor" who was responsible for getting Mark Ruffalo and other co-stars high during a Broadway production of The Moment When. Ruffalo previously discussed the incident on The Graham Norton Show in 2012,