Information systems have become the nervous system of our societies, but the perception of the risk of computer attacks is very hazy, because this is a complex area and we have not yet experienced attacks with major consequences. This article transposes some key elements of the financial crisis to the world of information systems in terms of the dangers of toxic interconnections, the management of crises and unlikely events and network resilience. It asks whether we have to wait for a societal crisis due to an attack on networks to happen before we understand that the risks are very real.