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A secret many have been dying to know: was Mr. Rogers, host of the children’s show “Mister Rogers’ Neighborhood” actually a U.S. Marine - or maybe a Navy SEAL? - at one point in his life? As the U.S. Naval Institute themselves say, no: Mr. Rogers did not wear a sweater to hide a “Born to Kill” tattoo. No-one is quite sure where the ex-killer rumors originated, but even without the U.S. Navy debunking those claims it’s hard to imagine doing anything other than teaching children.

This is one urban legend that just won’t die. While there were in the making of Hoover Dam, zero involved workers slipping into the mix and being covered up with concrete. It’s not hard to see its prominence in the human consciousness though, with six bodies buried in Montana’s Fort Peck Dam.

We all heard this one as kids: you can’t pee in the pool because there’s a special chemical that turns the water around you red...or blue, or green, but the point is that everyone will be able to tell. Fortunately for six year-olds everywhere, .

No one is quite sure where this particular urban legend originated, but there is nevertheless the pervasive fear that if birds consume rice they explode. Throwing wedding rice was especially feared, as it would provide ample grains for the unfortunate avians. Fortunately, .

In the 1990s, a scary urban legend emerged - needles infected with HIV positive blood were being , lying in wait to infect innocent bystanders. Despite some stories of , no cases of HIV infected needles being distributed in this fashion have been recorded.

Part urban legend, part fake news, part crossed wires describes the coverage of presidents moving historical busts in and out of various rooms in the White House. In Obama’s administration, he reportedly sent a bust of Winston Churchill back to the British embassy: (). Now in Trump’s, controversy surrounded him of Martin Luther King ().

It’s tempting to believe: if you can just unlock the other 90% of your brain, you’ll become a , or a . Unfortunately, is here to ruin our fun with some solid evidence that we are constantly using 100% of our brain.

A household urban legend is that shaving causes hair to grow back thicker. Although that certainly feels true when dealing with short, stubby hairs post-shaving, there is actually to back this up.

In 1964, TIME published about a list depicting eerie similarities between the lives and deaths of John F. Kennedy and Abraham Lincoln. The list , and contains facts ranging from similar election years (Lincoln 1860, Kennedy 1960) to number of letters in their surnames (seven).

It is widely accepted that Friday the 13th is an unlucky day. The . Some think Chaucer's "Canterbury Tales" first painted Friday as an unlucky day ("and on Friday fell this all mischance"), but the rise in modern myth came with the release of "Friday, the Thirteenth" by Thomas Lawson. The association of Friday the thirteenth and bad luck spun from there, until it became firmly cemented as a valid superstition.

While most urban legends on this list have been scientifically refuted, the conspiracies surrounding Area 51 are harder to debunk. Area 51 is a top-secret government site in Nevada, about 100 miles from Las Vegas, and has been a conspiracy theory factory for over four decades now. Although , rumors surrounding UFOs and CIA activity prevail.

Ah, . A woman is driving when someone behind her flashes their lights and begins following her. Spooked, she runs home, dials the police, and quickly discovers that the tailgating vehicle was trying to warn her about the killer in her backseat.

There a lot of myths around Coca-Cola, but one of the most well-known ones is that a glass could dissolve a tooth overnight. Fortunately, (although no-one is arguing Coca-Cola is good for your teeth).

This horrific tale tells the story of a Soviet experiment that involved locking participants in a chamber and pumping in a gas that kept them awake from days on end - . There is little evidence that any such experiment happened.

A similar urban legend is that gum, when swallowed, stays in the stomach for seven years. This is false: gum is mostly digested, and stays in your body for . The warning likely came from an instinctive aversion to swallowing something that could, theoretically, stick to your throat.

Does cracking knuckles really cause arthritis? According to several studies, . This urban legend likely evolved because mild swelling can occur when knuckles are vigorously cracked, or because of the irritation others feel when someone next to them is cracking their knuckles.

As 2017 was a it’s fitting Nessie has earned a place on this list. The monster is said to inhabit the Loch Ness, a lake in the Scottish Highlands. It has been an area of fascination for , a BBC team claims to have .

Emerging in Puerto Rico in the 1990s, legends of the chupacabra depict a mangy, hairless, blood-sucking monster that preys on livestock (). BBC debunks these claims, suggesting that the terrifying animals sighted are actually just that cause hair loss and other disfigurements.

Some people have to tracking down the Abominable Snowman. Rumoured to be a shaggy, towering figure that lives in the Himalayas, there have been many Yeti sightings over the years and little hard proof. However, the National Geographic suggests there may be a to to the phenomenon.

These have been cropping up since the mid-1970s, and have been a ever since. What could cause such intricate patterns? How do they do it at such scale? UFO sightings are of a crop circle, feeding into the idea that extraterrestrial life is somehow responsible. Alas, The Telegraph offers us a perfectly reasonable explanation.

An internet forum creation, Slender Man first appeared on a forum in 2009. Tall, with grotesquely long arms and legs, Slender Man quickly found his way into photoshopped pictures, where the legend grew that he was there to terrorize. It’s a dark urban legend: As well as , the Slender Man figure was inspiration in just a few years ago.

They’re reptilian, they’re large, and they live in the sewers of New York City. No, not the : alligators. Like most urban legends, this one is rooted in . That being said, that there are colonies of alligators running around in New York’s sewers.

One of the most terrifying urban legends stems from what should be a relatively innocuous figure: the clown. The story usually features some variation of a babysitter who calls the parents of the house to ask if she can cover up the large, creepy clown statue in the corner of the playroom...only for them to reveal they have no such thing. It’s possible this legend developed in response to the infamous 70s serial killer , who was known in his neighborhood for dressing up as a clown at children’s parties prior to his arrest. Gacy may also be responsible for lingering coulrophobia, a phobia that have.

The legend of the vanishing . Stories typically describe someone stopping for a hitchhiker, and said hitchhiker vanishing whenever they get where it is they need to go. Jan Harold Brunvand's book The Vanishing Hitchhiker suggests the legend has equivalents across the world.

No sleepover was safe from Bloody Mary. Legend has it, you must light a candle, go into a bathroom, and chant "Bloody Mary" at least three times. Although there are from young girls who have supposedly had some terrifying experience with Mary, it is generally regarded to have , and has little basis in reality.