That is, until this week when it released a YouTube video of a monkey appearing to play the classic video game Pong with its mind.

The video stars Pager, a 9-year-old macaque monkey who had a Neuralink implanted in either side of his brain roughly six weeks prior, according to the narrator.

While he was maneuvering the joystick and happily slurping up his smoothie, the Neuralink devices in his brain recorded his brain activity, monitoring more than 2,000 electrodes implanted in the region of Pager’s motor cortex that controls hand and arm movements.

That Neuralink data was then fed into a “decoder algorithm” to train it to predict Pager’s intended hand movements in real-time based on which neurons were firing.

He then appears to play a game of so-called MindPong with no joystick in sight.

“A monkey is literally playing a video game telepathically using a brain chip!!” Musk said in a tweet sharing the video Thursday.

If you’re interested, Neuralink also shared a video showing what the raw data behind Pager’s neural activity looks like while he’s busy playing.