Friday The 13th: Do You Believe In Superstitions?

It's Friday the 13th, a day famous for bad luck, but how did this come about?  It's believed to be traced back to the last supper and Judas being the 13th guest; also that Christ was crucified on a Friday.

Today is a big day for those who are superstitious. Here are a list of some of the most common superstitions.

Walking Under a Ladder
Black Cats Are Bad Luck
Opening An Umbrella Indoors Is Bad Luck
Breaking A Mirror Brings Seven Years Bad Luck

Do you believe in superstitions? Do you have some more to add to the list above?