This time decided to deal with a word which traces its orgin to German. Infact it is german and has made its place in the English language. Doppelganger or fetch is the ghostly double of a living person. It also refers to a situation of having a glimpse of yourself where it couldn't have been your reflection. I first came across this word in the Agatha Christie novel "Bertram's Hotel" where Miss Marple investigates the claim of a Chaplain who says he sighted his doppleganger in the hotel.
It derives from Doppel (double) and Gänger (goer). As is true for all other "native" nouns in German, the word is written with an initial capital letter, however English usage varies.In English, the word is conventionally uncapitalized (doppelgänger). It is also common to drop the diacritic umlaut, writing "doppelganger". The correct alternative German spelling would be "Doppelgaenger".
They are generally regarded as harbingers of bad luck. In some traditions, a doppelgänger seen by a person's friends or relatives portends illness or danger, while seeing one's own doppelgänger is an omen of death. In Norse mythology, a vardøgr is a ghostly double who precedes a living person and is seen performing their actions in advance.
The doppelgängers of folklore cast no shadow, and have no reflection in a mirror or in water. They are supposed to provide advice to the person they shadow, but this advice can be misleading or malicious. They can also, in rare instances, plant ideas in their victim's mind or appear before friends and relatives, causing confusion. In many cases once someone has viewed his own doppelgänger he is doomed to be haunted by images of his ghostly counterpart.
Other folklore says that when a person's doppelgänger is seen, the person him/herself will die shortly. It is considered unwise to try to communicate with a doppelgänger.