Sir Michael Gambon has admitted that he collapsed twice back in 2009 while playing a big part in the theatre show 'The Habit of Art'.
Talking about the incidents, the 72-year-old actor said he got so frightened while playing the major part that he collapsed and was rushed to the hospital, the Daily Express reported.
Gambon, who is well-known for his portrayal of Albus Dumbledore in the 'Harry Potter' films, further asserted that he underwent all sorts of tests but the doctors couldn't find any thing.
He also accepted that the problem was a result of ageing and added that it was 'dangerous' for him to continue in theatre.