One time, when I was 16, I had gone away for the summer to work and basically do what 16 year olds do when not around parental units. It was the greatest summer of my life. Anyway, when I returned home to my basement room I started hearing a scream every now and then. Scared the heck out of me. I thought maybe it was a neighbor kid messing with me by screaming in my basement window. I became determined to catch them. I set up cameras to spy on my windows from the outside. Again the screaming came. Always when I least expected it. I checked my footage....nothing. I was becoming unwound. Every time I would settle down for the night this screaming would occur, each time scaring the bejeezus out of me. After over a week of this I finially went to my father, almost in tears, and told him of my ghost. I was convinced. SO my father comes down into the basement and starts looking around. Nothing....and then... AHHHHHHHHHHHHHHHHH! The scream goes off! My father almost bumps his head on a cross beam in the ceiling! That was when I noticed my screen saver had kicked in. And it was bugs crawling across the screen. I had my pc audio output running through my Fisher Studio Standard Gold Edition Stereo complete with Dolby Digital surround. Apparently my brother changed my screen saver while I was gone on vacation. I never heard the scream when I turned the stereo off. I was genuinely convinced in ghosts for several days during that event. The haunting scared the poo out of me. Now though.....eh.