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:
Oscar Flores photo
John Palminteri photo
Pascal Le Segretain/Getty Images
Philipp Schmidli/Getty Images
Public Domain/Wikimedia Commons
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From Taronga Zoo via CNN
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