One thing I really enjoy about robot competitions like RoboGames and Mech Warfare is the friendliness and openness of the participants. Even when they are trying their best to defeat, and potentially demolish, each other's robots, they still manage to keep it polite and friendly.
Take for example, the Shibata - Che Edoga Mech Warfare Hardcore rivalry...
Note: As of February 9, 2012 the video was not available via Youtube. I will monitor it's status and post when it comes back online.
Rodman777, a top class sumo robot builder in his own right, posted the 23rd All Japan Robot Sumo Tournament official video below. For those not familiar with robot sumo, Rodman is one of the key organizers of the Baltic Robot Sumo and European Robot League events, and competes regularly at RoboGames in the US.