I owned at Brainball (Wired NextFest)
Brainball is an anti-intuitive game if I've ever seen one. To win, you must be more relaxed than your opponent.
The game consists of a table with a track down the middle that the mind-controlled ball rolls on. The two players wear a headband with sensors that detect how stressed out you are. The player that rolls the ball 2 out of 3 times into their opponent's goal wins.
It's actually pretty simple to win: Just cross your eyes and think of nothing. (Something I'm pretty good at.)