While at a wedding a few years ago in an old North Carolina house I went "ghost hunting" for a few minutes; I went from room to room upstairs before most of the other guests, taking pictures of the windows and french doors, and being careful that I didn't see anyone on the other side as I took each picture. To my great shock, one of the photos seemed to show what looks a bit like a man wearing a tricorner hat and something pink sitting behind him; it wasn't there in the picture taken seconds earlier and as I said I was watching by eye to make sure I didn't catch anyone as I took each picture.
I'm not much of a ghost believer myself, but I have to say it was fun to find something I couldn't immediately explain.