Casu marzu, which means "rotting cheese" in Sardinian, is not just an aged and very smelly cheese, it is an illegal commodity in many places. Casu marzu is a runny white cheese made by injecting Pecorino Sardo cheese with cheese-eating larvae that measure about one-half inch long.
Tradition calls for this cheese to be eaten with the maggots running through it. Sardinians claim these critters make the cheese creamier and that it's absolutely delicious. This cheese is widely, but not openly, eaten in Sardinia, even though the ban on it is only enforced sporadically.