He also had a black eye. Asked about it by a reporter, the world’s richest man said the injury was caused by his 5-year-old son, X, whom he shares with the singer Grimes.

Musk’s son X, whose full name is X Æ A-Xii Musk, is one of Musk’s children with Claire Boucher, a musician known professionally as Grimes.

Elon Musk said he asked "Little X," his oldest child with the singer Grimes, to punch him in the face. "And he did," Musk said.

Musk explains his black eye, says he told son X to punch him Elon Musk attributed his bruised appearance at a White House news conference to his son. “I said, ‘Go ahead, punch me in the face ...

Elon Musk appeared in the Oval Office during his last day as a White House employee sporting a noticeable black eye, which he said was caused by his 5-year-old son X Æ A-12.

He also had a black eye. Asked about it by a reporter, the world’s richest man said the injury was caused by his 5-year-old son, X, whom he shares with the singer known as Grimes.