From the 'Samurai Spirit' series, a Fight Quest-like concept hosted by K-1 fighter Nicholas Pettas. (I found this after watching the episode on sumo in the sumo thread.) YouTube - Aikido/ The subsequent parts are found by clicking the top link on the screen at the end of each clip. I'm not quite sure what to make of all of the things seen in this documentary, but it does seem that very skilled aikido practitioners are able to apply a lot of techniques to resisting, even trained attackers. However, it doesn't seem very practical, and my guess is that you have to devote a lifetime of study to achieve even a modicum of success. Still, an interesting glimpse of some of the principles that can make high level aikido work.