You roll out of bed in the morning and moments after find yourself tripping over a shoe and falling flat on your face. You get up and wonder which side of the bed was the right side, but then you glance at the calendar and discover the true reason for your early misfortune: Friday the 13^th.

Why is Friday the 13^th considered such a wretched weekday? Except for the fact that it’s a really unlucky day, most people don’t know much about it, and there’s much more behind the madness.

Here are 13 things you probably didn’t know about Friday the 13^th.

1. If you’re one of the nearly 20 million Americans who live in constant fear of Friday the 13^th, then you have friggatriskaidekaphobia. Yes, that’s a thing. I’ll let you decide what’s more nerve-wracking, Friday the 13^th itself or trying to pronounce that word.
2. Friday and the number 13 have been considered unlucky for centuries, and that’s thought to trace back to early Christianity. Friday is considered the day that Eve gave Adam the apple, which then got them both kicked out of the Garden of Eden. Judas was seated at the 13^th seat during the Last Supper. Somewhere in that, someone put Friday and the number 13 together and, obviously, people freaked out.
3. Fidel Castro was born on Friday, Aug. 13, 1926. Coincidence? I think not.
4. Too bad for all you friggatriskaidekaphobiacs; Friday the 13^th isn’t like Leap Day. There is at least one Friday the 13th every year, and there can be three at the most. Prepare yourselves: 2015 is bringing us three Fridays that fall on the 13^th in February, March, and November.
5. In 2012, Friday the 13^th fell on three days: January 13, April 13, and July 13. Each of those days was 13 weeks apart. Yes, really.
6. Many buildings like hotels and hospitals don’t include 13^th floors or rooms, and sometimes highways skip the 13^th exit.
7. Some common fears of Friday the 13^th include the classic walking under a ladder, knocking over a salt shaker, seeing a black cat, and breaking a mirror. But there are a multitude of other ones that are stranger like beards, dolls, and cornfields. Alright, I guess dolls are pretty creepy.
8. The number 13 isn’t actually considered unlucky to everyone: the Chinese and Pagans, think of it as a very lucky number. 
9. President Franklin D. Roosevelt was said to be triskaidekaphobic; he refused to travel on the 13^th of any month and would never invite 13 guests to a dinner party.
10. Therapy is actually offered for people that fear Friday the 13^th. It gets that bad.
11. For all you tattoo lovers: some tattoo parlors across the country offer specials for people who get tattoos of the number 13. If you don’t mind having bad luck permanently inked on your skin for the rest of your life, I’d say it’s a pretty good $13 deal.
12. The risk of getting into a car accident on a Friday is higher than on any other day of the week. Maybe instead of going out on Friday the 13^th, you should stay home.
13. Interested in warding off all this bad luck? According to superstition, you could try touching wood, crossing your fingers, and avoiding looking at a full moon through a pane of glass.

Whether you believe in the superstition or not, the friggatriskaidekaphobiacs of the world will be elated when Saturday comes around. So go ahead and rock your four leaf clover necklace or bring your lucky rabbit’s foot key chain to work, because you can never be too lucky!