The business sector loses about a billion dollars 4 times a year on this day. Some people will not make business transactions on Friday the 13th. Others won't even go out of their houses!
I've heard a couple of stories of how this day became so "unlucky". One involves a tyrant rounding up his enemies, taking their land and their lives. Another points to the Last Supper, where 13 men shared their last meal together on that Friday evening just before their Leader would be arrested, tried illegally and crucified.
Ironically, we call it GOOD Friday. It was the darkest day in human history, which would lead to the brightest Sunday in human history.
My wife and I celebrate Fridays when they fall on the 13th. After all, our first date was on Friday night, October 13, 1978. 37 years later, we are still dating.
I think it is all a matter of perspective. Do you believe in the sovereignty of God? Do you think He has it in His power to go great things on this day, as He has every other day? Psalm 118:24 says, "This is the day that the Lord has made; let us rejoice and be glad in it."
God has this day in His hands, just like He had yesterday, and just like He will have tomorrow. Trust Him with all of your days!
Satisfy us in the morning with your steadfast love,
that we may rejoice and be glad all our days.
- Psalm 90:14