https://www.vice.com/en_us/article/884wpa/why-did-elon-musk-tweet-tank-tesla-stock-price

It's Friday, Tesla CEO Elon Musk is making a ton of reckless tweets, and the sun is out, so now seems like a good time to blog. I've got an argument for why Musk tweeting that Tesla's stock price is too high—theoretically an insane thing for a CEO to do, especially given that he's already been barred by the SEC from tweeting about Tesla stock without permission—is the least ludicrous thing he's tweeted today. It involves Bitcoin, because honestly we all died in 2012 and reality is now a Möbius strip of punishment.

After Musk's tweet, Tesla stock immediately fell by over 10 percent.