Paraskavedekatriaphobia (again.)

Why Friday and why 13 ??

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Let's start with 13 :

At any hotel there is no. 13 room or a 13 floor .
some people refuses to stay at the 14 floor if they knew there is no 13 one.
13 was known to be unlucky number because of the number 12 .
Number 12 was considered to be the number of completeness , 12 Months , 12 hours a day, 12 signs of zodiac .
So, the number 13 was considered to be irregular , transgressing completeness.

Friday:

Friday was considered to be unlucky day as it's believed that Jesus was crucified on Friday.

And to combine the two unlucky things together :

The actual origin of the superstition, though, appears also to be a tale in Norse mythology. Friday is named for Frigga, the free-spirited goddess of love and fertility. When Norse and Germanic tribes converted to Christianity, Frigga was banished in shame to a mountaintop and labeled a witch. It was believed that every Friday, the spiteful goddess convened a meeting with eleven other witches, plus the devil - a gathering of thirteen - and plotted ill turns of fate for the coming week. For many centuries in Scandinavia, Friday was known as "Witches' Sabbath."

Every Friday 13 , American companies loses about 750 million dollars because people don't fly or do what ever they normally do every day.

Now , after hearing the whole Para...(whatever) thing , I will tell what I think..
There is no such unlucky day , every days are equal .
If you considered that a catastrophe will happen to you every Friday 13 it will happen to you , but only because you are waiting for it.
If I told you now to stop for a moment and try to find 10 bad things in the place where you are sitting , you will name things you didn't even notice it before , that's what happens when you
stop for a whole day and wait for something bad to happen to you.

I have lots of things to add , And I also have A ton of sheets to be delivered , so I'll go now and edit this post another time :)

Reference : Wikipedia Friday 13