Hmm...I'm not entirely convinced that ghosts exist, despite the strange things that have happened in my current home & my old one. I figured there's reasonable explainations for them.
When we were living in our old house, me & my sister decided to mess around with a make-shift Ouija(?) Board because our parents were out. Nothing happened at first, until my sister said something silly like "if there are any spirits here, make yourself known." We burst out laughing & then we heard the front door open & close. We figured our parents were back, so we went to the door, but nobody was there. It was kind of creepy at the time.
This happened in my old house too. I had just turned off the TV - not put it stand-by with the remote, I turned it off with the button on the TV. I left the room to get a drink & I heard something coming from the living room. I went to check what it was & it turns out that the TV had somehow turned itself back on.
Another thing that happend was, me & my sis were talking one night, when we saw & heard the bathroom light turn on, the strange thing was, we didn't see anyone go in the room. So we sat there watching. After a few minutes the light was turned off, but no-one came out. Me & sis turned to eachother with a "Huh?" expression on our faces & then decided it was time to get to sleep.
Another TV related insident occured in my current home; it was about 2 am & the whole family was in bed, but me. Everything had been switched off at the mains, apart from the computer I was usuing. Then I heard something coming from the living room that sounded like the news on TV or something. So I went to check & it typically went quiet. However, I wasn't the only one who heard it, because my dad came downstairs to check what it was also.
The first three things insidents happened when I was around 10, so I figured perhaps they were just my imagination, apart from the bathroom light thing. That was just odd. However, the last one I mentioned only happened about three years ago. Hmm...now that I think about it though, it could have been our neibour's TV me & my dad heard. The walls are pretty thin & the loud noises just bleed through.
Oops...I kind of rambled on for a bit there, sorry about that ^^'.