One with an odd story: ocarinas. These have a range of functions, as toys, fake educational aids, bird lures, gaming props, sculptures, and instruments of ritual, as well as normal musical instruments. In the last category, the best value for money are usually the Austrian ones made a few decades each side of 1900. They weren't made with perfect quality control and were mostly painted black. If you're buying on EBay, you do NOT want one with a shiny intact paint finish - that means it was never seriously played. If the paint has rubbed off around the fingerholes, you know somebody used it for a real musical purpose for years, so you can count on it being one of the better ones.