Check this idea out:

People can affect Random Number Generators (RNG) with their thoughts. What if you made a little robot, and attached an RNG to it. The RNG would control its movement, therefore all movements of the robot would be random.

Then, you get someone to affect the RNG attached to the robot with their thoughts.

Wouldn't that be trippy? To alter the behaviour of a robot using only your thoughts; with no apparent interface devices?