based on research by: Heather N. Gibson

Most people steer clear of the number 13.
Buildings usually omit the 13th floor, some jurisdictions never assign a 13th street address.
Most dinner parties make an effort never to have a party made up of 13 guests.
It is believed that the 13th guest is unlucky and will die an untimely death,
this superstition stems from the 'last supper' in which Christs's betrayer, Judas, was the 13th guest.

Even the Norse were weary of the number.
They have a legend in which 12 gods hold a banquet. the gods forget to invite Loki, god of mischief.
Loki then crashes the party, becoming the 13th guest.
Loki plays a malicious trick on the gods, resulting in a death.

This story is mirrored in a Greek myth.
Twelve olympians have a party, neglecting to invite Eris, goddess of discord.
Eris invites herself , once again becoming the 13th guest, to the party.
While there she throws a golden apple inscribed, `For the Fairest` into the center of the room.
The Trojan War has been attributed to the resulting battle over who deserved the golden apple.
This legend makes the Greeks very weary of the number 13.

Many other cultures had a strong stance on the number.
The Ancient romans and some sects in India disapproved of the number.
Ancient numerologists believed that 12 meant completion,
making 13 a number that no one wanted or needed,
a number that exceeds limits...