TIL about Casu martzu, a Sardinian sheep milk cheese that contains live fly maggots

The larvae of the cheese fly (Piophila casei) are deliberately introduced to pecorino cheese, where their digestive action produces an advanced level of fermentation, including a breakdown of the cheese's fats. The cheese's texture softens, and a liquid called làgrima ('teardrop') may seep out.

Source: Wikipedia.