Friday the 13th is a day that many people don't want to see a black cat or break a mirror.

It is not clear when the date became associated with bad luck, but studies show more than 20 million Americans have some sort of fear about it.

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According to legend, you should never change your bed sheets on Friday the 13th or you will have bad dreams.

If you have 13 letters in your name, like Jack the Ripper, you have what is called “devil’s luck,” according to legend.

And some people are so afraid of the date they refuse to go to work on Friday the 13th.

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Prosecutor Skandalakis has previously suggested that pursuing criminal charges against President Donald Trump may not be feasible until after he leaves office in 2029. (Craig Hudson/Politico/Bloomberg via Getty Images)

Credit: Bloomberg via Getty Images