Ate both of these while I was in China:
Sea Cucumber - it's very bland and rubbery. Not as rubbery as most squid, but similar. There's almost no flavor.
Sheep stomach - I actually loved it. It was cut into very thin strips, put on skewers, and then barbecued over open coals. Seasoned and covered in peanut sauce. A bit chewy, but delicious!
Also in China, I was at a restaurant with a large group of people and we ordered Beijing Roast Duck and when they brought it out, it was just a pile of sliced meat on a plate with the duck's head split open right next to it. Reach in with your chopsticks and pick out the brain. I was too chicken to try but my then-girlfriend did. She didn't like it though.