Though I never had one (they are rare in France), it became sort of a pop culture icon. For me it was through the work of Rebecca Sugar on Adventure Time.
I always liked to play silly made up songs, so I made a silly instrument to go along with it!
If you want to listen to a true musician using it, I recommand Hijaq's work on YouTube[1]. He uses many other pocket instruments if that is an interest of yours!
[0]: https://en.wikipedia.org/wiki/Omnichord