OH GOD WHY



I like liver, so I like haggis, when it's well-made. I've also had some nasty haggis, and a bad haggis is truly disgusting.
Natto is an acquired taste, but is really no worse than any other fermented food when it comes right down to it. It's better if you think of it more as a condiment than a main ingredient.
Casu marzu, though... well, I feel it is in a category of its own, which is "live animal food". I don't eat a lot of live animals, or really any if you don't count bacteria, and it kind of freaks me out. Culturally, I am also conditioned to be disgusted at the idea of eating terrestrial insects, so that part puts me off quite a bit. However, I would like to try it, if I ever have the chance.