Lin Robinson commented, "Casu marzu, literally translated as "rotten/putrid cheese", is a traditional Sardinian sheep milk cheese, that contains live insect larvae. Honest. Wikipedia says so."
Edited to add, this is haggis... which is a little embarrassing because, first, I'm Scottish and, second, I like haggis. However, the ones I've had didn't look like this, but like this:
Which is much more appealing to me.
This is Casu marzu
And yes, there are larvae in it...