
In an article by About.com's David Emery, he explained some culture's disdain for the number 13:
It is said: If 13 people sit down to dinner together, all will die within the year. The Turks so disliked the number 13 that it was practically expunged from their vocabulary (Brewer, 1894). Many cities do not have a 13th Street or a 13th Avenue. Many buildings don't have a 13th floor. If you have 13 letters in your name, you will have the devil's luck (Jack the Ripper, Charles Manson, Jeffrey Dahmer, Theodore Bundy and Albert De Salvo all have 13 letters in their names).
Continued on in his article, Ebory quotes an old tale:
One hundred years ago, the British government sought to quell once and for all the widespread superstition among seamen that setting sail on Fridays was unlucky. A special ship was commissioned, named "H.M.S. Friday." They laid her keel on a Friday, launched her on a Friday, selected her crew on a Friday and hired a man named Jim Friday to be her captain. To top it off, H.M.S. Friday embarked on her maiden voyage on a Friday, and was never seen or heard from again.
And one story that resonates around the world is the tale of the Knights Templar, recounted by Katherine Kurtz from Tales of the Knights Templar
"On October 13, 1307, a day so infamous that Friday the 13th would become a synonym for ill

So what about all the other "bad days" that have happened in the world's history?
The atomic bombs hit Japan on August 9th, a Thursday.
And 9/11 happened on a Tuesday.
The Titanic sunk on April 14th, a Sunday.
And Martin Luther King Jr was shot April 4th, a Thursday.
And 9/11 happened on a Tuesday.
The Titanic sunk on April 14th, a Sunday.
And Martin Luther King Jr was shot April 4th, a Thursday.

And just in case I am wearing my horseshoe necklace...and a green shirt (you know the luck of the Irish thing....).
