Favorite FICTIONAL Languages

What are some of your favorite INVENTIVE/FICTIONAL languages as well as ones that you enjoy hearing/listening to the most from TV shows and movies to video games and music?

Here are a couple of mine to start off with:
The Na’vi language (Spoken by the indigenous Na’vi people of Pandora in Avatar)

Nibelian/The Nibel language (Spoken in the Forest of Nibel from Ori and the Blind Forest)