Today is Friday the 13th, the first of three 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:
Library of Congress
Al Hayat Media/CNN
Julie Denesha/Getty Images
Boy Scouts of America
Pete Souza/The White House
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