Where there's smoke...there just might be an angry stage manager.

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.

we don’t even want Mark Ruffalo in this movie, so you’re going to take what we’re offering you or forget it.” That’s a cold one, no? But you’ve got to wonder—how do you go from that ...

"We love you. Us." Related: Mark Ruffalo Says 13 Going on 30 Is the Film Fans Ask Him About the Most: 'Love That Movie' (Exclusive) ...