Robot plays ping pong with Ding Ning (2016 Olympic champion)

This was cooler than the running events to me for two reasons: First, it alternates between forehand and backhand strokes. Second, when the paddle was placed in its hand, that precise orientation and position couldn't have been replicated exactly during training, since it's unlikely the robotic hand could grasp the paddle identically every time. This suggests the robot was trained to generalize to a range of possible orientations and positions—a crucial capability, because in ping pong, even tiny differences in the paddle's angle or position can determine whether the ball lands on the table or hits the ground.