A whistle made from an eggshell, fimo clay, and a straw. It sounds like this.

With my egg and the earlier turnip whistle, I tried poking some holes in the body to make an ocarina, but I found that it just stops whistling unless I cover the holes. On the other hand, the soda can ocarina worked just fine, relatively speaking. Are there any ocarina experts out there who can shed some light on this?