Nothing all that odd. Jelly fish, sea cukecumbers, sea urchin gonads, and baby eels.
Am told raw oysters and clams die when you take off the shell, but am not sure. Have looked carefully to see the heart beating, and have not detected it. But am afraid I am usually far more interested in enjoying the mollusk than examining it.
Before criticizing a person, walk a mile in his shoes - then you are a mile away and you have his shoes!