On one particular occasion I went into an antique shop and my friend and I decided to go upstairs. We both were standing up there and we both looked at the same "antique" old school school desk at the same time and we got this big chill. We both looked at each other and decided it was haunted.
We left the antique shop not long after this. The weird thing was there was nothing odd about the desk. It was just a regular old school desk with a chair connected to it and such. but we both got spooked by it at the same time. Now researching object attachment I learned that antiques and collectibles are well known for their frequency of spirits attaching themselves to them.
So not knowing anything about it as well as looking at the same item at the same time and getting the same feeling we decided it was haunted.
More things spooky at www.keepthedeadalive.org