The distributed denial-of-service attack failed to crash those payment networks, but David says Anonymous did manage to poke around their back-end computer systems.
At the same time, huge regional differences between the treatments paramedics give mean your chances of surviving a heart attack or a car crash may well depend on where you live.
During the past 15 years or so international bank regulation has been concerned mostly with the ability of the system to sustain shocks, such as a stockmarket crash, a foreign-exchange crisis or a terrorist attack.