Check out some of the most common superstitions -- including today, Friday the 13th.
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:
Warner Bros. Television
U.S. Army Signal Corps
Courtesy of NOAA/Institute for Exploration/University of Rhode Island
David Shankbone/Wikimedia Commons
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