Vitamin A toxicity from eating polar bear liver. The liver of polar bear is dangerously high with vitamin A.

Following damage to the facial nerve as in Bell's palsy, misdirection of the regenerating fibres may innervate the lacrimal gland rather than the mouth muscles and the parotid glands. Consequently, chewing food causes weeping. Legend has it that the crocodile has compassion and remorse for its prey and wept with sorrow when it eats its prey.

Valsalva's retinopathy. The build-up of pressure in the venous cava causes the retinal vein to burst and produce haemorrhage.