A 94th Academy Awards that steadily maintained a buoyant spirit was rocked by an unbelievable exchange after Will Smith took offense to a joke made by Chris Rock about his wife, Jada Pinkett Smith.

After Rock joked to Smith that he was looking forward to a sequel to “G.I. Jane,” Smith stood up from his seat near the stage, strode up to Rock and slapped him. After sitting back down, Smith shouted at Rock to “keep my wife’s name out of your (expletive) mouth.”

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The moment shocked the Dolby Theatre audience and viewers at home. At the commercial break, presenter Daniel Kaluuya came up to hug Smith, and Denzel Washington escorted him to the side of the stage. The two talked and hugged and Tyler Perry came over to talk as well.

Smith is widely expected to win his first Oscar later in the ceremony.