Last year my friend and I were bored and I recorded her in my bedroom. My house is supposedly haunted. I say supposedly because I don't really believe in ghosts. Anyway, there's a sound or a voice right after she laughs. that was also the moment i stopped recording and then later resumed. the noise at the end is thunder, but there's another noise inside of it. Those sounds (besides the thunder) were not heard by either of us during the recording. We didn't hear it until we played it back.
http://www.youtube.com/watch?v=kbLiZC7cLnU
http://www.youtube.com/watch?v=kbLiZC7cLnU