The Mathematicians Experiments

i wanted to complain about, well, so lovingly complain about mathematicians. I perform, show various experiments on table top demos and so on,. And hopefully they have some surprise element. But in order to has the s i usually ask my my spectators, or my my friends to guess what's going to happen. Yes, of course, that's very nice, because you kow r guessing. By the way, guessing is extremely important, because if you guess right, you can be very proud. If i gess wrong,  that's an opportunity to become more intelligent.