I'm very open-minded about food and will try anything once.
Having said that, the only food that I will draw a firm line at (so far) is Balut - half-formed duck eggs in the Philippines.
Your first sentence says it all, man.
As far as 'no way in hell am I eating that' foods, balut is probably one. I had the opportunity many times to try them in Manila, but wasn't near drunk enough any of the times, I guess. Everyone else in our party ate them with gusto.
I won't eat anything primate and raw brains I will not eat, as well as some dishes that contain uncooked blood. Most anything else I will try at least once.
