Puffer fish (or fugu) is a delicacy in Japan, but prepared him wrong and make him eat is deadly. Only a cook with many years of training behind him, the fish is served. There was Great Big Story this beautiful movie about.
Different organs of a puffer fish sitting tsjokvol tetrodotoxin, a poison that 275 times as toxic as cyaankali. That is Japanese but not in the way to the other parts of the fish to eat, because that would be delightful. Only condition is that the chef that the fish dish to prepare, knows what he is doing.
As a chef Yutaka Sasaki, who has already 45 years of fugu serves in his restaurant. In this video you can see him at work.