Phobias

Triskaidekaphobia (from Greek treis meaning "3", kai meaning "and", deka meaning "10" and phobia meaning "fear" or "morbid fear") is fear of the number 13; it is a superstition and related to aspecific fear of Friday the 13th, called paraskevidekatriaphobia or friggatriskaidekaphobia.
The term was first used by Isador Coriat in Abnormal Psychology.[1]
There is a myth that the earliestreference to thirteen being unlucky or evil is from the Babylonian Code of Hammurabi (circa 1780 BCE), where the thirteenth law is omitted. In fact, the original Code of Hammurabi has no numeration. Thetranslation by L.W. King (1910), edited by Richard Hooker, omitted one article:
If the seller have gone to (his) fate (i. e., have died), the purchaser shall recover damages in said case fivefold fromthe estate of the seller. Other translations of the Code of Hammurabi, for example the translation by Robert Francis Harper, include the 13th article.
Some Christian traditions have it that at theLast Supper, Judas, the disciple who betrayed Jesus, was the 13th to sit at the table.[3] However, the Bible itself says nothing about the order at which the Apostles sat. Also, it is because Satan(devil) was the 13th angel.
http://en.wikipedia.org/wiki/Triskaidekaphobia (27-feb-12)
Some buildings number their floors so as to skip the thirteenth floor entirely, jumping from floor 12 tofloor 14 in order to avoid distressing triskaidekaphobics, or using 12a and 12b instead. This is sometimes applied to house or room numbers as well. The same is also true of rows in aeroplanes.
Thecomposer Arnold Schoenberg suffered from triskaidekaphobia. It is said that the reason his late opera is called Moses and Aron, rather than Moses and Aaron (the correct spelling with two As) is becausethe latter spelling has thirteen letters in it. He was born (and, it turned out, died) on the thirteenth of the month, and thought of this as a portent. He once refused to rent a house because it had...