Tesla MODEL S Operating Manual page 211

Easter Eggs
Emissions Testing Mode
TRAX
210
Holiday fun can come in surprising ways. Access Emissions
Testing Mode from your Easter Egg tray, then select your
preferred fart style and a target seat. Activate by pressing
the left scroll wheel button when you're ready to "release"
your prank.
It's never too late to follow your dream of becoming a
world-famous DJ. With TRAX, you can turn your vehicle into
your own personal music studio. While in Park, choose from
an array of instruments and unique sounds to create the
next hit song. Access TRAX through your Easter Egg tray on
the touchscreen and get jamming. Microphone and headset
not included (depending on vehicle configuration and
market region, this may not be available on your vehicle).
Model S Owner's Manual