We have all heard of the piano, organ, guitar, or even drums. This instrument takes the cake. It's called the Chapman Stick. Not Chap Stick.
This was developed by Emmett Chapman in the late 1960s and early 1970s, the Stick is an electric stringed instrument that allows players to combine bass, melody and chords using a unique two-handed technique. This instrument is a beast because of the fact that you are combining piano, guitar and bass all in one.
If your a serious musician this is an instrument that can pose a challenge but it's a fun instrument to play.
Here is a sample video of the Star Wars being played.