Why did will Smith hit Chris Rock at the Oscars?

Why did will Smith hit Chris Rock at the Oscars?

Will Smith Slaps Chris Rock Over Joke About Wife At Oscars

Will Smith Slaps Chris Rock Over Joke About Wife At Oscars 

Will Smith stormed the Oscars stage and struck comedian Chris Rock across the face for joking about his wife, in a moment at Sunday's gala that immediately went viral and left stunned viewers questioning if it had been scripted or genuine. 

Will Smith stormed the Oscars stage and struck comedian Chris Rock across the face for joking about his wife, in a moment at Sunday's gala that immediately went viral and left stunned viewers questioning if it had been scripted or genuine.