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:
Henry Galvan photo
Dave Alley photo
John Palminteri photo
Source: Ventura County Sheriff's Office
Amanda Valdes photo
Oscar Flores photo
Vicky Nguyen photo
Keith Carls photo
Courtesy: Santa Barbara City Fire Dept.
Ethan Miller/Getty Images
Scott Olson/Getty Images
Florida Lottery via Facebook
Powerball via CNN
Spencer Platt/Getty Images
Joe Raedle / Getty Images
USDA FSIS via CNN
HRH The Duchess of Cambridge via CNN
Joe Raedle/Getty Images
Jerry Markland/Getty Images
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