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Chakka35, sorry if I'm going over old ground, I'm new to here, and I should have checked back old threads. As I've got older, I must admit I too have come to believe it's to do with the unconcious movements of the participants, but as you say, it's a very weird sensation. Probably, the subconcious desire of the participants to want it to work. I'm still to this day puzzled by that wallpaper answer, I swear none of us had been in that flat previously, and the only one in the room who would have known was not even near the table. Weird.
MrMoonshine, Point taken, we were young and foolish (weren't we all, once), but once the initial shock of the glass moving was past, we found nothing "scary" in it at all. We were all reasonably intelligent lads, who just wanted to try to understand what exactly was going on. Still not sure!!