fucking pmsl.....
they do NOT work ever,,,,,....
we used to do loads of em, and noticed a pattern....
if all the group lightly rest their fingers on the glass, someone without really knowing it will choose the first letter,...
the more letters that are used, the more likely it is for the rest of the group to help move the glass to other letters,...
ie: lets say i start by moving it towards t.....many mnay words begin with t, so you can guarantee that someone else will have thought of a word.....
eventually, the group will all be thinking the same word,...and thus,..making the glass go to remainder missing letters........if you get me...lol....
arl