all this stuff doesn't exist i think. its because when u think that something bad is gona happen u more else believe it is and it eventually happens. but if u believe that friday 13 is the best day ever then it will be..it just matters on ur point of view..if u have a bad point of view on something than something bad will happen but if u have a good outlook then good things happen...but sometimes that doesnt help...there are some things that are just out of ur control..
why is it considered unlucky if the 13th is on a friday?
well some say the true unlucky day is Thursday the 12th,and my friend proved it to me when last month the server crashed for his favorite MMORPG,after a whole bunch of people manipulated a glitch that came with a new patch that was added that day.