Worried about today being Friday the 13th? If so, beware: There'll be two more this year.

Superstitions have surrounded Friday the 13th since the Middle Ages. The entertainment industry hasn't helped quell peoples fears either. Movies such as Friday the 13th--and it's plethora of sequels, featuring the hockey-masked Jason, merely add fuel to the fire.

(The original movie poster is pictured here).

So what's Friday the 13th all about?
Here's some snippets from Yahoo! News:
http://news.yahoo.com/s/livescience/20090213/sc_livescience/13factsaboutfridaythe13th