If you're one of those people who avoid traveling, going to work, eating in a restaurant or signing important documents on Friday the 13th, you have paraskevidekatriaphobia. There is no need to call the doctor. It means a fear of Friday the 13th. Here are some superstitions about Friday:

  • Never change your bed on a Friday as it will give you bad dreams.
  • If you start a trip on a Friday, you'll have misfortune.
  • Cut your nails on a Friday and you cut them for sorrow.
  • If ships set sail on a Friday, they will have bad luck.
  • Friday is the witches' Sabbath.

Here are some superstitions about the number 13:

  • 13 is the Devil's Dozen.
  • Should 13 people eat dinner together, all will die within the year.
  • Just as many buildings don't have a 13th floor, going right from 12 to 14, many cities don't have a 13th Street or 13th Avenue.
  • If you have 13 letters in your name, you will have the devil's luck. Don't believe it? Count the letters in these infamous names: Jack the Ripper, Charles Manson, Jeffrey Dahmer, Theodore Bundy and Albert De Salvo.
  • There are 13 witches in a coven.

It's bad luck to:

  • Begin a new job or a trip
  • Cut off both ends of a loaf of bread
  • Flip your mattress
  • Put new shoes on the table
  • Leave your hat on the bed
  • Walk under a ladder
  • Pour water on a windowsill
  • Plant potatoes
  • Lean a broom on a bed
  • Open an umbrella indoors
  • Do housework
  • Wear new clothes
  • Cut your hair
  • Sneeze to your left side
  • Have a black cat cross your path