Elon Musk: billionaire, entrepreneur, and man with a Twitter account. It’s a lethal combination that means when Musk tweets, we must ask questions. Namely: is he serious?

Last month, the SpaceX CEO sent out a string of tweets complaining about traffic. He suggested that a possible solution might be to start a tunnel-digging firm called — wait for it — The Boring Company, following it up by saying “I am actually going to do this,” and updating his bio to read: “Tesla, SpaceX, Tunnels & OpenAI.” This morning, he repeated the claim, and even assured a questioner that he was, in fact, serious:

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