Six robots enter, one robot leaves, kind of. This is an unedited video of an unofficial event at a local robotics competition we held this past weekend, so it's rather long, but it has some interesting points. The six participants are using the same Pololu 3Pi robot, but all of the robots were programmed independently by different people. The robots are following the line at just under a meter per second. The eventual "winner" is playing a Hungarian rhapsody while the third place finisher is playing one of Bach's fugues (mine was the one that finished second).
I think next time I'm going to add a sharp sensor to the back of my robot so that it can slam on full reverse and take out the people behind me.