We may make jokes about Friday the 13th and only kiddingly instruct loved ones to exercise greater care on that day, but those who suffer from a fear of the number thirteen (triskaidekaphobia) or a fear of Friday the 13th (paraskevidekatriaphobia) may genuinely feel limited by the rumored potential for ill luck connected with the date.
Tip o' the stetson to snopes.com And Refdesk.com - for those of you with kids - or just the innately curious, this site can be a lifesaver. However as with any site on the interwebs - make sure they got it right if possible! I don't think I've ever found them to be unfactual (heh) but you never know! And of course wikipedia.org!