since hevusa has set a precedent for urbandictionary as unimpeachable and objective evidence, here is some absolute proof for the existence of ghosts
ghost
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1) The discarnate soul of a deceased human being or animal still occupying the physical realm. These spirits may or may not know that they are dead. They can also be called forth.
2)Residuals.
3)A demon, angel, saint, or Christ Himself.
4)A poltergeist.
There are actually many kinds of ghosts, but to name them all and give definitons would be impossible, due to a limit of space.
The kind of human or animal ghost that is an actual sentient being is called an apparition. Many of these beings are restless because they do not know that they have passed on due to unexpected events that ended their lives, or believe they have unfinished business to attend to. Many occupy places they frequented during life. Some do know that they are dead, and may come back for reasons of revenge, or to comfort or warn a loved one of some kind of impending disaster, or to lead them to some fortune or treasure. Others just like to hang around and see what's going on with other people. The ghosts who do the same things over and over again are the ones who don't know that they are dead, and are actually prisoners of their own minds: It may be the year 2006, but in the mind of the ghost of a person who died 100 years ago and didnt expect or realize it, it's still 1906 and he's still trying to perform whatever action he was preoccupied with when he died. They can also be called forth by seances and Ouija boards, but you better know what you're doing when you call forth a spirit. If you're poorly prepared, if not at all, you could bring upon yourself some really weird and terrifying results that will not go away. It has happened, people.
2)A residual is a ghost that has no intelligence behind its actions. It acts just like a ghost trapped in its own mental prison of time, the difference being that a residual is psychic energy imprinted on the fabric of time and space, stress ...