Am I allowed to say "ew"?

I'm all for adventure when it comes to eating. As a kid, I ate tripe, fish eyes, squid tentacles, marrow, and head cheese, without giving it much thought. I was one of few people I knew when I first started college, before it became trendy, who had eaten raw fish and actually enjoyed it. I've had frogs' legs, sea urchin, eel (what is it about creatures from the ocean that make most people squrim?), haggis, black pudding (not to be confused with the sort found in D&D), and dinuguan, which is pork stewed in its own blood. More recently, I tried sea cucumber for the first time.

But when I read this post, I wondered: How far is too far? Is there such a thing as being "too adventurous" — and by that I mean, when does it become less about eating and more about being able to say you've eaten something out of the ordinary? And then the real question: Would I eat it if someone placed a bowl of risotto topped with cockscomb and duck tongue? Maybe, just to say I had. But there are certain foods that I do truly find disgusting, like poultry heads and feet, so that dish, in particular, pretty much grosses me out.

What about you? Are there any foods you just won't eat? (Which is different from foods you can't, like ones which you are allergic to or don't eat as a matter of principle — yeah, I'm talking to you, vegetarians.)