<ul><li>Elon Musk joked about the source of his bruised eye as he stood next to President Donald Trump in the Oval Office.</li><li>Musk mentioned he was playing around with his son, X Æ A-Xii, and jokingly asked him to punch him in the face, resulting in the black eye.</li><li>Reporters have frequently seen Musk's oldest child, nicknamed Little X, accompanying him to various official visits.</li><li>Musk's last day as a special government employee marks the end of his 130-day limit, and he will now focus on his company Tesla.</li></ul>

Elon Musk tells the story behind his black eye

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