I think I may have told this story on the board before, but we did a ghost tour at Colonial Williamsburg. The guide was a little boring (the meth hadn't kicked in yet) so I wondered off to take a picture of building. I cranked the shutter open and took a long exposure using a tree branch to hold the camera still. I caught a reenacter as she left the building done for the day, nead down and walking briskly.
As I rejoined the group the guide snarkily asked me if I got a picture of the ghost she had been talking about. I said, "I'm not sure" and showed her the picture I had taken. The reenacter had left a slight trail behind her because of the slow speed. The guide stammered "This, this has never happened before." Of course the whole group is crowding around looking at the screen on the back of the camera. People started running over to the same spot to take the picture and then thought it was confirmation of the supernatural when "the ghost" was no longer there. The guide, looking shaken and a little pale, did nothing to reel everyone back in. It was chaos.
My wife looked at me and said "why?" I gave her my innocent face and shrugged and smiled.
(Full disclosure, it was neither the first nor the last time she uttered that word to me. My reaction is always the same.)