Tarrare was a slender French man who lived in the 1700s. He had a bizarrely insatiable appetite which could never be satisfied. He would regularly eat a meal intended for 15 people in one sitting and under medical observation ate cats, snakes, lizards, puppies and an entire eel without chewing. He would scavenge for offal in gutters, rubbish heaps and outside butchers' shops, and attempted to drink the blood of other patients in the hospital and to eat the corpses in the hospital morgue. He was even suspected of eating a toddler.
Teratoma, Greek for monster, is a very rare type of tumor that humans can develop which is capable of producing hair, teeth, bone and complex organs such as eyes and brain-matter, eyeballs, hands, feet and in rare cases it even develops an internal cyst containing a structure that resembles a fetus.
In 2002, Antron Singleton a.k.a rapper “Big Lurch” murdered his girlfriend. He was found naked in the street staring at the sky after having cut his girlfriend's lungs out and chewing on them while on PCP.
In 1912, a 4-year-old boy named Bobby Dunbar mysteriously disappeared. After an 8-month search, investigators believed that they had him in Mississippi with a woman named Julia Anderson who claimed to be his mother and called him Bruce Anderson, but courts favored the Dunbar Family. He lived as Bobby Dunbar and died in 1966. In 2004, DNA tests concluded he was not a Dunbar.
15Charles Bonnet syndrome
Charles Bonnet syndrome causes vivid hallucinations, but not due to mental illness. As many as one-third of the people who lose their vision can suffer vivid and cartoonish hallucinations. The brain fills in with what it has seen before as the eyes deteriorate. People rarely report them because they're afraid they are losing their mind.
Clinical lycanthropy is a rare psychiatric syndrome which causes the person affected by it to believe that they can or have already shapeshifted into a non-human animal. Patients behave in a manner that resembles animal behavior, for example howling, growling, or crawling.
Danny Casolaro was an investigative journalist who was working to uncover a secret group controlling the CIA, White House, etc. Despite telling friends and family that if he is found dead, it wouldn't be a suicide, he was found dead in 1991 after meeting with an unknown source.
Epidermolysis Bullosa is a disease affecting a skin-binding protein. It literally causes the skin to fall off with the slightest touch. Children born with the disease are known as "Butterfly Children" because their skin is as fragile as a butterfly’s wings.
Human botfly is the only species of botfly known to parasitize humans routinely by capturing mosquitoes and attaching their eggs to their body. The larvae develop inside the skin after falling off the mosquito through the mosquito bite area. They hatch and then the larvae burrow in the skin and eat your tissues until they emerge as a fly that resembles a bumblebee.
Naegleria fowleri is a brain-eating amoeba which is found in warm bodies of water. If it gets up your nose or otherwise finds its way into your brain you are dead. Less than 1% of the people with naegleriasis survive. You'll have a high fever, hallucinations, and intense pain which painkillers won't work on (as the pain is coming from inside your brain), fall into a coma and die within 5-7 days of exposure.