An excerpt reprinted from LiveScience:
The origin of the link between bad luck and Friday the 13th is murky. The whole thing might date to Biblical times (the 13th guest at the Last Supper betrayed Jesus). By the Middle Ages, both Friday and 13 were considered bearers of bad fortune.
In modern times, the superstition permeates society. Here are [some] of our favorite Friday-the-13th facts:
1. Fear of Friday the 13th — one of the most popular myths in science — is called paraskavedekatriaphobia as well as friggatriskaidekaphobia. Triskaidekaphobia is fear of the number 13.
2. Many hospitals have no room 13, while some tall buildings skip the 13th floor and some airline terminals omit Gate 13.
3. President Franklin D. Roosevelt would not travel on the 13th day of any month and would never host 13 guests at a meal. Napoleon and President Herbert Hoover were also triskaidekaphobic, with an abnormal fear of the number 13.
4. Mark Twain once was the 13th guest at a dinner party. A friend warned him not to go. "It was bad luck," Twain later told the friend. "They only had food for 12." Superstitious diners in Paris can hire a quatorzieme, or professional 14th guest.
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And from USA TODAY:
This one is super fast, with only one lucky day to play...today. Tomorrow morning, I'll randomly choose the winner and post that person's name...so please check back to see if you've won. Happy Friday the 13th, and good luck to you!