The RB2000 robot from JR Robotics and VStone is able to perform some impressive acrobatic feats. Our friend, Lem, over at Robots Dreams captured some video of the
RB2000 twirling about on the highbars. However,
... since the robot doesn't have any hands, the bar was passed through openings in the robots arms - so it's impossible to fall off. It does, however, demonstrate the considerable torque available from the JR servos used in the arms.
Even so, the demonstrations of this robot's abilities has generated quite a bit of press for JR Robotics. You can find out more about the RB2000 here and on JR Robotics' website.