In the throwback clip, the tech billionaire can be seen at a formal dinner doing something really weird with his silverware.

New details about Elon Musk's relationship with ketamine have emerged a few days after the tech entrepreneur announced his departure from the White House. Although Musk had previously mentioned using a "small amount once every other week,

Musk has spoken about his prescription ketamine use in the past. Last March, he told journalist Don Lemon that he uses a “small amount” of ketamine about once every other week. The ketamine, he said, is prescribed by “an actual, real doctor.”