Elon Musk tweets 'take the red pill' in another strange turn for the billionaire - 2020-05-17
At its most basic level, the tweet is a reference to a scene from the 1999 movie 'The Matrix,' in which the character Morpheus tells the protagonist Neo that he has been living in a computer simulation and is given the choice of taking a red or blue pill. "You take the blue pill, the story ends, you wake up in your bed and believe whatever you want to believe. You take the red pill, you stay in Wonderland and I show you how deep the rabbit-hole goes." (It's worth noting that Musk does seem to believe there's a good chance we're living in a computer simulation.)
But taking the red pill, or being "red-pilled," is much more commonly used on the internet to denote a right-wing political awakening. It's often used in forums dedicated to topics like Donald Trump or "men's rights" organizations.