I study the unintended consequences of autonomous vehicles, particular as related to parking and pedestrian behavior. With human-driven cars, expensive parking encourages people to ride public transit and leave their cars at home, but in a world full of AVs, the need to pay for parking may disappear. We may see AVs cruising slowly — a lazy river of cars — on neighborhood streets rather than paying for parking. Pedestrians, meanwhile, may gain the upper hand in their interactions with autonomous vehicles, since they can play “chicken” knowing that the vehicles will stop for them to cross the street. The impacts on cities depends on how planners respond – whether by erecting fences to corral pedestrians, or seizing the opportunity to create more pedestrian-oriented streets.