The Otamatone was pretty funny, and queer. I wouldn't want to actually try making music with it seriously; I would just fool around with it for laughs. HANG sounded really melodious, and that makes me wonder how it works!
That vegetable video reminded me of one where someone demonstrated a potato's electrical properties by lighting up a bulb, oddly enough. Would those vegetables still be edible after electricity had been passed through it?
Furthermore, there is a futuristic sculpture under the Panopticons series called the Singing, Ringing Tree which is supposedly a musical instrument. It makes eerie noises when the wind passes through it.