Recently in Phobia Category

http://www.youtube.com/watch?v=IDi2NlsA4nI

I couldn't embed this so you will have to go look for yourself......

Dossey traces the fear of 13 to a Norse myth about 12 gods having a dinner party at Valhalla, their heaven. In walked the uninvited 13th guest, the mischievous Loki. Once there, Loki arranged for Hoder, the blind god of darkness, to shoot Balder the Beautiful, the god of joy and gladness, with a mistletoe-tipped arrow.

http://news.nationalgeographic.com/news/2004/02/0212_040212_friday13.html