Of course the new software update for Tesla cars has a hidden feature. Of course,fingering videos it's a sketch pad.

And of course, Tesla CEO Elon Musk announced the feature with a drawing of what appears to be a farting unicorn.

Musk shared two drawings, the other one being a slightly displeased Mona Lisa, complete with a signature and all.

Made today on Tesla sketch pad pic.twitter.com/Z8dFP2NN41

— Elon Musk (@elonmusk) March 30, 2017

We'll leave it to the cruel, cruel world of Twitter to critique these. As for how to get the sketch pad in your Tesla, Musk shared that, too: Tap the T on your Tesla's center screen three times.

If you just downloaded V8.1, tap the the T on center screen three times

— Elon Musk (@elonmusk) March 29, 2017

One user recorded a video showing the sketch pad in practice. Interestingly, when you're finished doodling, you don't get an option to save your file; instead, you can either quit or "submit your artwork to Tesla," whatever that means. Perhaps we'll see a gallery of the best sketch pad doodles soon?

@elonmusk i love this 😂😂 pic.twitter.com/ExFLzW9Dfl

— LIAM BOLLING (@liambolling) March 30, 2017

The easter eggs on new versions of Tesla software have now become a tradition. Previously, we've seen one that displays your virtual Tesla on a Mario Kart Rainbow Road, while a far more elaborate trick turns the car into a Christmas light show miracle.