This nice one becomes the deadliest fish ever. after its own death. You probably heard the famous Japanese meal call fugue. This kind of dinner may be your last if the chef makes even the slightest mistake while removing the liver.
The thing is the liver of the puffer fish contain a neurotoxin that is 1000 times more powerful than potassium cyanide. So, if you want to try this meal without it being your last supper, go to a very good restaurant.