In Norway, we call this class of error "a Kenneth", after everyone who logged in to see their tax return in 2012 received the tax return of a guy named Kenneth. The culprit was allegedly a misconfigured load balancer.
Once a colleague made an accounting error and it showed that we're in debt something like 100 million.... I told him to stay calm and relax, we don't have that kind of money so why worry :)
