Do you believe in ghosts?

Ghosts are nothing more than disembodied spirits with unfinished business in this world. I've experienced paranormal activity at least three times in my life. Once at my aunt's with her younger brother and I witnessing a moving white object in the dark hallway from outside (aunt also walked in her daughter's bedroom middle of the night to find her talking to a lady in white in her sleep that suddenly disappeared). Another time I saw thick blue smoke rise between me and the newspaper I was reading that rose straight into the ceiling and disappeared. No source of flame or ignition. Also as a teen in my bedroom I felt my mother's hand grab my shoulder and I turned around to find no one there, then realized she was at work. Got a call later that a relative had died around that time. I have other stories but don't want to bore you. You can't prove these are real, but you can't prove they're not real either. There's a lot of things in this world we just don't understand.