A couple friends of mine told me that on a very hot day, when they were little kids, they went into the basement of one of their houses & decided to mess with one. They took it from where it was & brought it into the family room. They started playing with it & the basement started getting cold, to the point where they each grabbed a blanket (not attributing it to anything at this point). The next thing that happened was they were startled by a very loud crash, like a shelving unit in the room the board was kept in had tipped over. They went to look, and nothing was out of place.
At that point, they put the board back in the box, put the box back in the room it came from and quickly left the house.