"What's the most unusual thing you've ever eaten?" is a question wasted on the Chinese. They don't consider anything unusual - it's all bloody delicious.
With a bit of probing though, I got my students to accept that perhaps Stir-fried Cocooned Silk Worm is borderline unusual. Donkey Stew fell into that category as well.
Eventually one student admitted that the time her mother served her placenta, she was a little bit put off.