During the Oscars ceremony on Sunday, Will walked onto the stage and slapped comedian Chris Rock after he compared his wife Jada Pinkett Smith - who has the medical condition alopecia - to G.I. Jane.
In an interview with 6abc Action News of Philadelphia, Carolyn Smith insisted she had "never seen" her son act in such a way before. "He is a very even, people person.
That's the first time I've ever seen him go off. First time in his lifetime. I've never seen him do that."