I'll try anything once, e.g. Ants (hormigas colonas) from Colombia. But, I've only had one thing I couldn't finish. A friend from Ukraine made a salad with mayo, pickled herring, onions, and beets. Threw in the towel on that one.
Here in Orange County (lots of asian areas) its common for them to put red beans in the frozen yogurt. no. no no no no no. no
I'll eat mostly anything but I can't stand onions. I tried human before too. Way too salty. And it was hard for them to sit still whenever I went for a bite.
I just read this entire thread and didn't see anything I hate. I have yet to try Balut or Durian, but might be willing. I will usually try anything once. The most unusual for me was the heart of a tuna cut out immediately after it was caught. Did this one in Pago Pago..