Balut isn't so bad if you can get past the texture of the feet and beak. I really can't think of a food in the US that I find totally repulsive. The ones I don't care for, I mainly don't like because of the texture.
I once at a raw octopus tentacle and it nearly choked me. It sucked onto the back of my throat, and I couldn't swallow it or cough it up. I finally got it down after chugged a couple of beers.
I'll pretty much eat anything, but one thing I'd refuse to put in my mouth would be hakarl from Iceland.
