Elon Musk sported a black eye, which he blamed on his son X, at a Friday press conference as he departed from the Trump administration. Musk said he told his son to hit him as hard as he could.

President Donald Trump praised Musk’s work as head of the Department of Government Efficiency during the press conference. One thing that drew the press’s attention was Musk’s appearance — the black eye on the right side of his face. When asked about it, Musk offered a humorous explanation.