The way the number 13 was or is unlucky is based on Biblical Christianity and during the Last Supper, the final meal Jesus shared with his Twelve Apostles before his crucifixion, Judas was believed to be the 13th guest.
13 is considered to be unlucky as a number and Friday the 13 is also considered to be unlucky.
Friday the 13th is considered an unlucky day and superstition says or at least suggests that bad luck and bad things will happen to you or your family on Friday the 13th.
However for me I've had good luck on Friday the 13th so to me it's not always an unlucky day.
On Friday the 13 superstition says that you'll have bad luck and bad things will happen to you on Friday the 13th so you should not venture out and stay home etc.
Although that is just superstition as you can have bad luck any day and actually I've had good luck and good things happen to me on Friday the 13th so you don't always have bad luck on Friday the 13th.
Friday the 13th is considered an unlucky day in Western superstition.
It occurs when the 13th day of the month in the Gregorian calendar falls on a Friday, which happens at least once every year but can occur up to three times in the same year.
Just like walking under a ladder, crossing paths with a black cat or breaking a mirror, many people hold fast to the belief that Friday the 13th brings bad luck.
Though it's uncertain exactly when this particular tradition began, negative superstitions have swirled around the number 13 for centuries.
Many think that the reason for the number 13's bad luck comes from the Bible.
Judas, who betrayed Jesus, is thought to have been the 13th guest to sit down to the Last Supper.
Things that you should not do on Friday the 13th include.
Eat foods just the right size to choke on.
Use a vending machine.
Open an umbrella inside.
Walk alone in a dark alley.