Man I've had a few things that I'd rather not eat again - pig brain, ox intestines, duck tongue, shark fin soup (what a waste of shark), fugu, sea cucumber and some of those gelatanous cubes of fish crap - but the worst had to be raw "Shirako" -aka- Cod Fish Sperm Sacs.
I could only slather down a couple of gooey chopstix worth. That it strings away from it's blob like form with this irredescent mucousy texture is about all you can stand but the fact that it is like that on the tongue is even worse. And it was one of those that you aren't really told what it is until you have it on the palate. yeeech!
Now jelly fish tentacles, on the other hand, are pretty good. And the fact that my host was right-on when he told me: "those, ah, kreen you light out"! foont!