Fugu

Osaka is of course famous for its Octopus delicacies, but it also known
for its “Fugu” or Blow fish.
As its known, only licensed restaurants can serve Fugu fish,since
there is a specific technique of cutting the fish or else the poison
from the body of fish can spread all over and result in the death of the
person eating the fish. Most restaurant serving Fugu have huge paper
Fugu fish outside there restaurant like this -

Now this is one fish who keeps the possibility of revenge open, I must say.

On another note, found this picture which will make me more unpopular
with my sushi loving friends -