fugu - a fish used in Japanese sushi. Claimed to be the best tasting of all, but parts of it are incredibly pooisonous. So if the chef makes a tiny mistake in preparing it you die in agony wuthin 24 hours. There is no known antidote or cure. No, I'm not joking, this is real. People really do eat it, despite the risk.
And there is a famous case of a Japanese actor who, in 1975, died after insisting on ordering and eating four servings of this delicacy, which was the specific reference.