Today is Friday the 13th, the last of three we've seen 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
Ethan Miller/Getty Images for Clear Channel
Adele.com via CNN
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iStock / Terraxplorer
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Irving Police Department via CNN
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