The thespian, who reprises his role as wizard Gandalf in the new Peter Jackson movie, found it difficult to shoot scenes on his own with just photographs for reference - and he reveals he threw a tantrum.
He tells ContactMusic, ""In order to shoot the dwarves and a large Gandalf, we couldn't be in the same set. All I had for company was 13 photographs of the dwarves on top of stands with little lights - whoever's talking flashes up.
""Pretending you're with 13 other people when you're on your own, it stretches your technical ability to the absolute limits.
""I cried, actually. I cried. Then I said out loud, 'This is not why I became an actor'. Unfortunately the microphone was on and the whole studio heard.""