3. Blood Disorders. Blood disorders such as hemophilia and leukemia can cause unexplained bruising, often because your blood fails to clot properly. If you have severe and frequent unexplained bruising, it's a good idea to see a physician to rule out such disorders, especially if it seemed to come on suddenly.
Puffer fish contain the potent neurotoxin tetrodotoxin. TTX is thought to be synthesized by a bacterial or dinoflagellate species associated with the puffer fish. The toxin is concentrated in the liver, gonads, and skin. The level of toxicity is seasonal, and, in Japan, fugu is served only from October through March.
Not only deadly but terrifying as the symptoms include total paralysis of the victim; although the brain is still fully conscious and aware of what is happening. TTX is found in the livers of Puffer fish, certain newts, Blue ringed octopus, Gobie fish, Star fish, Parrot fish, Sea squirts, and Angel fish.