I don't know that I've ever seen what could be called a ghost but I've sensed a lot of things. I said before in another thread that according to the first law of thermodynamics, energy cannot be increased or decreased, it simply changes form. So that would mean that there's all kinds of energies floating around us. (auras?) Some people feel them, some people don't. So maybe there is a scientific explanation for ghosties after all.

Mister said that when he was a boy, and his grandfather died, he saw him. Came to his bedroom and stood there by the bed and looked at him for a minute, and he was gone. An old college roommate said the same thing about her grampy, too. Another friend told me of his friend, a man who died not from cancer, but from the experimental treatment. He and his wife both saw this man after they buried him. Maybe when people don't get to say goodbye, they come back and tell you.

There's a lot of folk songs about that sort of thing, so there must be something to it.