Casu Marzu, anyone? I'd rank it right up there with Balut in the looks-so-gross-that-I'd-never-go-near-it category. Heck.. I'd probably call it worse. It's basically rotten cheese that's eaten in Sardinia - so rotten that insect larvae are present in the cheese. Eye protection is mandatory when eating it, unless you remove the larvae manually. Don't want the insects to get in your eyes!
On the topic of foods that I've actually tasted, blue cheese makes me want to vomit. I cannot stand the taste at all. I was at Disneyland one summer and bought a bleu cheese burger for the first time, which could have ruined the rest of my day there if I actually ate all of it. Fortunately, I had the sense to throw it away and head for the next loooong line for a classic ride.
Jam it back in, in the dark.