Shia LaBeouf excessively erratic

Actor Shia LaBeouf, who grabbed headlines because of his unpredictable behaviour while shooting for his forthcoming movie 'Fury', says the recent bouts stemmed from lack of confidence in his own acting abilities. 

"I'm not a really confident actor. I don't have faith in my abilities," theguardian.com quoted the star as saying. 

The 28-year-old actor slashed his own face with a knife and got a tooth removed for the war movie Fury to get into the character of a war-ravaged soldier.