ok years ago my mates gf done that with a group of her freinds , she told me all about it , and for once im serious here i do muck about on here but its true , they got in contact with someone from the other side , and the glass was moving it went on for a few min people asking questions to the dead person ect the glass was moving to answer the questions slowly but moving , then someone who was in the room said out loud he was sitting in a chair about 3 feet from the other people doing the board , what a load of crap someones moving that glass and laughed , all of a sudden he was slammed up against the wall by a unknown force , out of the chair and againist the wall , my mates gf screamed and turned the light on , they all were pretty shook up , and that people is a true story , and there are a lot of people there i know who say its true , and they wouldnt just make it up , so be carefull what you mess with .....