There’s even a word for this fear: friggatriskaidekaphobia
Donald Dossey, founder of the Stress Management Center and Phobia Institute in Asheville in the US, said the phobia affects 17 to 21 million Americans alone.
“It's been estimated that $US800 or $US900 million is lost in business on this day because people will not fly or do business they would normally do," Mr Dossey said.
Symptoms of phobia may include mild anxiety to debilitating panic attacks.
There’s only one Friday 13 this year and it's already proving to be a special one.
Superstitious stargazers will be treated to a rare "Full Honey Moon," which hasn't happened on Friday the 13th for about 14 years.
So, full moon aside, here's what you need to do to avoid bad luck on this ominous day.
1. Don’t own, walk into, or help a friend look after a black cat.
Black cats are thought to be a sign of bad luck. Unfortunately, because of this superstition, black cats are half as likely to be adopted.

Black cats become extra frightening on Friday the 13th - if you believe in superstitions. Source: AAP
2. Instead, keep a cricket by your side for good luck.

Jiminy cricket from Disney's Pinocchio.
3. Don’t let a bird fly into your window or into your house.
It is thought to be bad luck.

4. Don’t walk under a ladder
It's just not a good idea.
5. Avoid unlucky numbers like 13 (obviously) and 666.
In some East Asian and Southeast Asian regions like China, Singapore, Malaysia and Vietnam, people also believe the number 4 is bad luck, as the pronunciation is similar to the word ‘death’. This fear of the number 4 is known as tetraphobia, and some buildings or apartments in these countries even skip floors 4, 14, 24 and so on.
6. And while you’re at it, don’t use umbrellas inside. Image
7. But if you need break a spell, turn seven times in a clockwise circle.
Seven is thought to be a lucky number.
8. Whatever you do, don’t break any mirrors.
Apart from being a hassle to clean up, some people believe mirrors hold bits to your soul.
9. If in doubt, knock on wood for good luck.
The symbolism of wood may come from the Christian belief that Christ died on a wooden cross to save humanity from sin.
10. And if all else fails, stay in bed until Saturday 14 comes along.
Just make sure you get out of bed on the same side you got in.
Good luck!
And remember not everyone is afraid of Black Friday- it's also a cause for celebration!
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