The puffer fish (or blowfish, or globefish) is probably the second most poisonous vertebrate (the most poisonous being a golden frog).
In Japan, Korea and China it is prepared by specially licensed chefs and is often eaten raw. I once ate it. The flavour was good, but no better than many other fish.
- The Toxic Puffer Fish: A Japanese Delicacy (gomestic.com)