I know that this isn't strictly speaking an instrument, but when I was doing my GCSE Music exam, I had to listen to some absolutely TERRIBLE "music" that consisted of some people going, "Awaiwjduwqosdjiwodhocneihfiwohomwghwo" Well at least thats what it sounded like. Apparantly it's African, but it sounded like a cat being strangled mixed with a goat mixed with a sheep in labour!! I'm not joking, that's what it sounded like!!