You bet I believe in ghosts! I have one. more specifically, a Rotom.
It all started one day, I was using my laptop. I go upstairs for some food, come back down, and find the file "Spooky_Laugh" opened. Freaks me out, thus I shut the laptop down. I turn it back on, and the entire thing doesn't work. It still doesn't now...
Due to the laptop breaking, I use the old crappy computer in another room (the one I'm typing this post with, btw). And out of nowhere, the printer turns itself on, and trys to print something! Thank God it had no ink, or paper.
Not as long as the others, but still as freaky. I left, my brother too, a room, my DS with it's volume on full, his all the way off. Come back down, the volumes are switched!
My cell phone had an alarm awhile ago to alert me of Pokemon. One night, at a friend's home, it goes off, but I deleted it! And at 12:45, oh joy.
And minor other electronic annoyances. But nothing major. Now it's targeting my mother, as she doesn't believe in it, so I assume it wants to prove its existance. Like a cell phone will go off, and she's certain one did, but they're aren't any. And her computer at her job is being a shit all of a sudden.