There's a good example outside music which is related to this: standing upright while your eyes are closed (to make it more complex you should keep one of your

There's a good example outside music which is related to this: standing upright while your eyes are closed (to make it more complex you should keep one of your legs off the ground e.g. as in yoga). If you start thinking about what you should do - you will most certainly start falling, since you begin to overcompensate for your micro movements.