I caught a quick article recently that said you could have some fun in a Tesla with Santa Mode. You enable this in a few ways, but the quick one is to activate voice control and say:

Ho ho ho

This will change the UI. From the normal car to this:

Your car becomes a sleigh with Santa and reindeer and other cars are reindeer around you. The car also plays a song.

You can also activate a different song with “ho ho ho not funny”.

I made a quick video to show how this works as well: Santa Mode

A fun holiday trick for passengers.