Elon Musk may have a no-nonsense public persona, but that doesn't mean he's all business.

Musk has been known to incorporate fun little quirks into Tesla vehicles. Instead of maxing out at a round number like 10, for example, the Tesla audio system's volume goes up to 11, a reference to a classic scene from This Is Spinal Tap.

Many of these features are hard to find--and they don't appear in the owner's manual or on the company's site. So last week, just in time for Easter Sunday, Musk tweeted that Tesla will soon provide a way to access all these Easter eggs with a single touch:

It's worth noting that Musk qualifies this with the word "discovered," implying there could be some that Tesla owners haven't found yet--or at least, haven't posted about on the internet.

With that in mind, here are some of the best surprises hidden within Tesla vehicles.

1. Psychedelic cowbell road

Rapidly press the Autopilot button four times in a row, and the street on your display monitor will turn from standard pavement into Rainbow Road from the beloved video game Mario Kart. The music you hear when the system starts up is the first few measures of SNL's version of "Don't Fear the Reaper," the Blue Oyster Cult song to which Will Ferrell can be heard enthusiastically slamming his cowbell.

2. Sketch pad

Tapping the T at the top of the main monitor three times turns the whole touchscreen into a sketch pad with a full color palette. Drawing while driving isn't recommended, but it's a great way to keep your bored passenger occupied, especially if that passenger is a kid who for some reason doesn't have a smartphone to play with. Once you're done, you have the option to submit your drawing to Tesla for critique.

3. James Bond submarine

Musk was so infatuated with the hybrid vehicle-submarine 007 used in The Spy Who Loved Me, he bought the real one at an auction in 2013 for $866,000. He also incorporated the sub into Teslas: Press and hold the T at the top of the touchscreen; then, when it asks for an access code, enter--all together now--"007." When you enter the menu's air suspension page, your vehicle's image will look like Bond's submarine. Just to work another pop culture reference in there, the "very high" to "low" suspension options will now range from a "depth" of 0 to "20,000 leagues." Tesla said it took a year for users to discover the gimmick.

4. Mars rover

As the CEO of SpaceX, Musk would be remiss if he didn't find a way to incorporate the Red Planet into Tesla vehicles. Entering an access code of "Mars" will turns your GPS map into an image of Mars's surface, with your vehicle's icon becoming a small robotic rover.

5. Rainbow charger

More rainbows! Press the charger 10 times in quick succession while charging your car and the port will put on a miniature light show. Way cooler than pumping gas.

6. Holiday show

With its December update last year, Tesla included a special feature for Model X owners: a light show, complete with music from Trans-Siberian Orchestra. Enter "Holiday" as an access code, step out, lock up, and stand back.