Does chance have a role in intelligent environments? In this work-in-progress paper we argue that chance and non-deterministic behaviour can play a fundamental and important role in intelligent environments. We discuss how this behaviour can be both destructive and constructive. Underpinning our ideas is the view that intelligent environments may be seen as a complex system of interacting services. In the first part of this paper we show that such complex systems can produce unexpected interactions that cause unplanned and often undesirable instabilities. However, not all instabilities are undesirable and in the second half of this paper, we present a conceptual notion that views system instability as a form of irrationality and propose a quantum control model for service agents within smart environments. We conjecture that irrational control models enable the service agents to perform better than if they were using traditional, rational, control models. Our purpose in presenting this work is to both provoke discussion and describe our early research on what we hope will be an interesting direction for intelligent building research.