Whoa, it takes a lot to gross me out food-wise. My only real hang-ups are melons, edible flowers and stems. I have a hard time with raw foliage. For what felt like years (it was probably only one) during grade school there was a potted African Violet in the center of the dining table and I couldn't look at the thick, furry stems while eating my morning Grapenuts and yogurt without my throat clenching up. Too much nature first thing in the morning.
It still really grosses me out to see spinach, arugula and the like with tough protrusions hanging off the leaves (cooked spinach doesn't bother me unless there is an egregiously firm tail or two that survived the sautee). I'm also scared of currently in fashion fiddlehead ferns, one reason why I've never visited any super-jungle-y parts of Malaysia—this wild plant worries me way more than sago worms.
I've been waiting for a real Hunan restaurant to show up in NYC but I most definitely won't be ordering the Hunan House's "hollow stem vegetable" pictured above and blogged about on Fork in the Road today. An all stem dish?! I'm going to have nightmares.