For Tesla Model X owners, the Mars/SpaceX-themed Easter Egg wasn’t the only hidden feature in the latest update that the automaker started to push this week. For Christmas last year, Tesla programmed the lights and Falcon Wing doors on three Model Xs to do a light show to the sound of the Wizards in Winter by Trans-Siberian Orchestra.

At the time, Tesla CEO Elon Musk said that the program will be an Easter Egg in the Model X, but it was never there until this week’s update.

Wizards in Winter by Trans-Siberian Orchestra has been a popular instrumental track for light shows since the 2005 internet phenomenon of Carson Williams’s 16,000 lights synchronized to the music.

Inspired by the feat, Tesla made its own light show using the Model X and its auto-presenting front doors and Falcon Wing doors.

To activate the new Easter Egg, Model X owners on the 8.0.2.50.15 software can enter “Holiday” as an ‘access code’ (holding the ‘T’ button for 5 seconds).

Update: Elon’s out with a good primer on the Easter Eggs:

To activate the Model X holiday performance, just type holidays or ModelXmas after pressing the logo. Also, Mars. pic.twitter.com/8Cy7YPlECX — Elon Musk (@elonmusk) December 24, 2016

The show will start after you exit the car, close all doors and press the lock button on the key fob. Tesla warns that the show “requires 6-feet of space above and around the vehicle.”

Some owners already released videos of the show:

This is the full version from Tesla staged with 3 Model X SUVs last year:

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