The cannonball fruit

Crescentia cujete fruit (Calabash tree)

The Calabash tree is found in tropical jungles of Central and South America. This tree produces a huge fruit that resembles (and weighs like) a cannonball. When fresh, the fruit is eaten. When dried and smoked, the fruit covering is used by native peoples as a container for food and liquids, as a cup, as a ladle, and even as a musical instrument (called the maraca). The fruit seeds contain an oil that's used as a medicine against colds.