OSCAR THE THERAPY CAT-Rhode Island's Steere House Nursing and Rehabilitation Center is home to a therapy cat with a special and frightening gift: he predicts when patients will die. As of January 2010, Oscar the cat has predicted the impending death of an estimated 50 terminally ill patients. It's believed that Oscar smells biochemicals that are released by dying cells in the body. Oscar is so correct in his predictions that staff members reportedly notify family members if he is seen sleeping in a patient's room for extended periods of time.

STORY OF JUNE AND JENNIFER GIBBONS-June and Jennifer Gibbons were a set of twins from Wales who lived their entire lives pretty much mute, only communicating with each other and no one else. They isolated themselves in their bedrooms for many years, playing with dolls and creating plays together. They turned to crime and committed a few acts of arson that got them both institutionalized. The twins reportedly had a longstanding agreement that if one died, the other must begin to speak and live a normal life. Jennifer died inexplicably while being transferred to a new institution, a death which June later described as a sacrifice in order for her to live a better life. "I'm free at last, liberated, and at last Jennifer has given up her life for me," June said. Jennifer's cause of death is still unknown

SCAPHISM-Without going into too much graphic detail, scaphism is an ancient Persian form of torture and execution that will chill you to the bone. The poor victim was trapped between two boats, force fed and covered in milk and honey until they got diarrhea, and then laid out in the sun to be eaten alive by bugs. This days-long execution style often resulted in dehydration, starvation, and septic shock. All in all, it's one of the worst ways imaginable to die.

PHANTOM TIME HYPOTHESIS-This is one Wikipedia page you can really get lost in. This historical conspiracy theory was brought into public thought by German historian Heribert Illig, in which he proposes that the year 613 was actually followed by the year 911. This would mean that everything that happened between 614 and 911 in the early middle ages of Europe and nearby regions is either wrongly dated or never happened at all. Illig has evidence to back up his claims, too: lack of archaeological evidence of the time period, the presence of Romanesque architecture and the relation between Julian calendars and astronomy all combine to point in his favor.

THE PACU FISH-This type of Pacu fish with its human-like teeth is absolutely terrifying. They're only found in South America, but one of these little guys ended up in a river in France somehow. There have also been incidents reported in Papua New Guinea where some men have had their testicles bitten off by these ferocious creatures.

WHITEHALL MYSTERY-During the building of Scotland Yard in 1888, the dismembered remains of a woman were found in three separate locations, while her head, left arm and right leg were never found at all. To this day, her identity and source of demise remains a mystery that is especially maddening given it happened at police headquarters.Was it Jack the Ripper? Your guess is as good as anyone's.

LONERGAN MYSTERY-If you remember the 2003 movie "Open Water" then you might be familiar with the story of Tom and Eileen Lonergan. The couple vanished while scuba diving in the Great Barrier Reef in 1998. Their scuba diving boat left their diving area without the two on board, which nobody onboard the boat realized until two days later. The fact that the bodies have never been found, in addition to the uncovering of mysterious diary entries years later that hinted at a possible suicide pact, makes this a harrowing tale of mystery that will now keep you up at night.

RAT KINGS-This disgusting but real phenomenon happens when a bunch of rats become stuck together with blood, dirt, ice, or feces. It's so terrifying that it's become a common folklore element in scary stories.

EUTHANASIA COASTER-How's this for twisted? The Euthanasia Coaster is an art design for a steel roller coaster that is literally designed to kill the people riding it. Designed by Julijonas Urbonas of the Royal College of Art in London, the purpose is to take lives "with elegance and euphoria." With one gigantic lift hill and seven inversions, this is one ride you don't want to go on.

COTARD DELUSION-Cotard Delusion is a terrifying but very real illness in which the person who has it is convinced they are dead. The denial of self-existence in this mental capacity is truly the stuff of nightmares

HINTERKAIFECK MURDERS-Hinterkaifeck is a tiny farm in Germany just north of Munich where one of the strangest crimes in German history was carried out. On March 31, 1922, the six inhabitants of this family farm were inexplicably killed with an axe. Two of the family members were also believed to have been in an incestuous relationship. The murder remains unsolved to this day.

AOKIGAHARA FORREST-Aokigahara is a forest at the base of Mount Fuji, commonly called either the "Sea of Trees" or "Suicide Forest." Along with the Golden Gate Bridge, it's one of the most common places for suicide in the entire world. The forest is notorious for its rocky caverns and being eerily quiet. It's also associated with demons in Japanese mythology and is believed to be haunted. Because of this, an annual body search is undertaken in the forest each year.

EYELASH MITES-The eyelash mite is a parasite found in the follicles of human faces, primarily in the nose, cheeks and most especially the eyelash area. They measure an incredible 0.012–0.016 inches long! They're pretty harmless to humans, but still, how gross is it that we live our daily lives with worm-like parasites feeding off our oils?!

EATING HABITS OF TARRARE-Tarrare was a real French showman and soldier who was born in 1772 and is remembered for having the most insane eating habits in history. He possessed an appetite that, no matter what he ate, could never be satisfied. He ate everything from cats and dogs to corpses from a hospital morgue. Tarrare's bizarre and extreme form of polyphagia which allowed him to eat so much is still a mystery today.

TAMAN SHUD CASE-This unsolved murder case has been a source of speculation and mystery for years. An unidentified man was found dead on December 1, 1948, in South Australia. A piece of scrap paper found on his body read "tamam shud," which translates to "ended" or "finished" in Persian. This paper was eventually discovered to have been removed from a copy of "The Rubaiyat," a collection of Perisan poetry that is centuries old. When the original book was found, it was discovered to have a secret code written inside its cover. Many relate this case back to the unsolved mysteries surrounding the Cold War. Still unsolved, public interest in the nameless victim and his strange death has only increased over time

LOCKED-IN SYNDROME-This syndrome is a very rare but completely debilitating disease. A patient experiences complete paralysis in their muscles while their mind and mental state remains completely intact. Pretty much all that functions is your eye muscles, meaning that you can see the world around you but cannot interact with it. Essentially, people with this horrible condition are trapped inside their own body.

UVB-76-This is like a creepy plot line from "Lost," only it's actually a real thing and it's somewhat terrifying. UVB-76 is a radio station that broadcasts short buzz tones all day long on a loop, averaging 25 buzzes a minute. Every once in a while, a voice transmission in Russian can be heard. It might sound anti-climatic, but the origins and purpose of the station have NEVER been known, making it yet another inexplicable mystery of the world