Well speaking of odd yet very cool musical instruments
(which I haven't been, but I will now) I recently ran across
the Stylophone Pocket Synth. The tiny instrument is made
to recreate the retro synth sounds of the late 60s and 70s.
The Pocket Synth has a range of about an octave and a half
and can do three different retro synth sounds, vibrato,
and has pitch bending capability.

Of course I'm sure that you could reproduce all of the
sounds of the Stylophone on any good synthesizer. But
what would be the fun of that? :p

"Stronger" on the Stylophone.