This combination of photos shows the Costa Concordia before, top, during, center, and after an operation was competed to lift the cruise ship to an upright position, on the Tuscan Island of Giglio, Italy. The crippled ship was pulled completely upright early Tuesday, Sept. 17, 2013, after a complicated, 19-hour operation to wrench it from its side where it capsized off Tuscany on the previous Friday the 13th, with officials declaring it a "perfect" end to a daring and unprecedented engineering feat.

AP Photo/Andrew Medichini

Why is Friday the 13th supposed to be scary? Is it unlucky? Maybe.

The roots of the superstition go way back, to before the 19th century, according to Elite Daily. People believed the number 13 was unlucky because it was one more than 12, a complete number – as in the 12 signs of the Zodiac, 12 tribes of Israel, etc. And some people still think that if 13 people sit down for dinner together, one will surely die, something that stems from the Last Supper. (And what day was Jesus crucified? A Friday.)

That dinner myth is absurd, but what isn't crazy is the weird stuff that has taken place on Friday the 13th throughout history.

On Friday, July 13, 1821, notorious Ku Klux Klan Grand Wizard Nathan Bedford Forrest was born. He distanced himself from the KKK later in his life.

On Friday, Sept. 13, 1940, the Nazis dropped a bomb on Buckingham Palace as part of the Blitz during World War II. The Royal family was apparently taking tea at the time, Elite Daily said.

On Friday, Oct. 13, 1972, a plane crashed in the Andes, killing 12 people instantly, while others were killed in an avalanche. The survivors resorted to cannibalism.

Speaking of ill-fated transportation, a cruise ship partially sank on Friday, Jan. 13, 2012, killing 30 people.

And in 1989, on Friday, Oct. 13, the stock exchange suffered a serious crash, said to be the second most damaging in market history at the time, Elite Daily reports.

Experts even predict bad luck on a future Friday the 13th.

On Friday, April 13, 2029, NASA says, Asteroid 99942 Apophis "will come scarily close to Earth ... but it will not hit."

Just coincidence? Or actual back luck? We're going to say coincidence; bad stuff happens every day, somewhere.

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