When several rat bikes gather together while travelling at slow speeds, some kind of attractive force seems to draw them into circular motions. Perhaps it is the mysterious attraction which twines rats tails together. In any case, a circular cul-de-sac or traffic circle will often trigger the "rodeo" response, sending the rat bikes chasing one another's tails. Often it is difficult to dissuade the rats from their centripital inclinations until the group, by chance or by exhaustion, happens upon a distraction, sending them off in tangents from the rodeo circle. Future experiments under controlled laboratory conditions may discover if, barring disruptions, the rats would continue to circle until their deaths from starvation.