How did Friday the 13th superstitions start, and do you believe in them?

I personally do not believe in all the Friday the 13th superstitions, to me it’s just another day. I always notice when it’s Friday the 13th, but maybe that’s because society has just conformed to the “fact” that Friday the 13th is an unlucky day?

I’m curious as to how these superstitions came about in the first place, and when it happened.

Do you believe that Friday the 13th, or even the number 13, is unlucky?