Will Smith's memoir appears to shed light on why he smacked comic Chris Rock at the Oscars.
The Men in Black actor, 53, says in his book that being made to feel like a coward is his 'most violent trigger' - after he grew up with an abusive father.
He penned that seeing his dad brutally beaut up his mother when he was just nine-years-old "defined who I am today more than any other moment".
