This tweet has some backstory, and it's all connected to SpaceX's Starlink program, which promises to provide affordable internet connectivity to people all around the world.
Elon Musk has been chastised by a Russian official for delivering Starlink internet terminals to Ukraine with the support of the US.
In a message to the media, former deputy prime minister Dmitry Rogozin, who is now the head of Russia's space agency, warned: "For this, Elon, you will be held accountable like an adult — no matter how much you'll play the fool."
Despite the fact that Elon Musk's statement was most likely made in jest, some of his colleagues are encouraging him to step up his security detail.
Others are now trying to make the hashtag #KeepElonSafe spread on Twitter.