11/16/2010 11:19 am ET | Updated May 25, 2011

Friday The 13th: 13 Superstitions That Show Our Fear Of The Number 13 (PHOTOS)

Friday the 13th is said to be unlucky because it combines a historically unlucky day and unlucky number.

The No. 13 has long gotten the human race riled up -- back to ancient times. It's even led to a condition called triskaidekaphobia, fear of the number 13.

That fear for 13 has led to some strange decisions and unusual behavior in the past. Here are 13 examples.

Friday The 13th: 13 Superstitions Related To Fear Of 13 (PHOTOS, POLL)