I remember when I was a kid, (around 15 years ago if I had to guess), there was an exhibit at a science museum where they used EEG to make a ball move on a table. Then they set up a game where two people would wear EEG on opposite sides of the table and the ball would roll toward whichever person could get their brainwaves to match a certain pattern better. I think the idea was if you quieted your mind then you would win.