Today is Friday the 13th, the only one we'll see this year after making it through three of them in 2015. Check out some of the most common superstitions.
Today is Friday the 13th -- considered an unlucky day by the superstitious dating back to the 19th century. Check out some other common (but silly) superstitions:
Henry Galvan photo
Kelsey Gerckens photo
Photo: CA Dept. of Fish and Wildlife
Dave Alley photo
John Palminteri photo
Source: Ventura County Sheriff's Office
Amanda Valdes photo
Oscar Flores photo
Chip Somodevilla/Getty Images
Egyptian Armed Forces
Andrew H. Walker/Getty Images
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Egypt Defense Ministry
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Library of Congress
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