Elon Musk, CEO of Tesla Motors, attends an environmental conference at Astrup Fearnley Museum in Oslo, April 21, 2016. Getty Images/AFP/HEIKO JUNGE

The last couple of weeks have not been the best for Tesla Motors, Inc. The stock price fell by about 13 percent in the week Tesla announced a bid for CEO Elon Musk’s SolarCity (it has recovered since).

A week later, the company came under investigation by the National Highway Traffic Safety Administration for a fatal crash, involving the company’s Model S sedan that was driving on its Autopilot feature. On July 1, another Model X was involved in an accident, and last week, the automaker announced it had delivered fewer cars during the second quarter of 2016 than it had planned to.

On July 10, birthday of Nikola Tesla — the visionary scientist whose name Elon Musk has appropriated for his electric cars company — the billionaire entrepreneur announced on Twitter that he is “working on Top Secret Tesla Master Plan Part 2.”

Although no one knows what Musk has in his mind, the tweet is reminiscent of a blog post from 10 years ago. Under the title “The Secret Tesla Motors Master Plan (just between you and me),” he had discussed his plans for cars that would later become the Model S and Model 3.

Does this mean we are going to see another futuristic concept being unleashed upon the world? Or as cynics would have it, is it just a ploy to divert attention away from all the negative news surrounding the company of late?

Either way, we will know soon. Meanwhile, in the hours since Musk’s tweet, there has been a lot of speculation about the nature of the secret plan.

And as always, there were some funny ones too.