I was so excited to share my news of Airth Castle five minutes ago, and then of course I just had to look at the Wikipedia page regarding ghosts. Airth Castle is said to be haunted and people have heard children playing, people crying and screaming, and a ghost dog roaming the hallways. Super. I also found this Ghost Finders investigation report.
I'm still excited to spend the night in a castle and will obviously take a ton of photos this weekend. I just might not sleep.