Yesterday evening, North Korea was unceremoniously knocked off the internet by a distributed denial of service (DDoS) attack. This comes shortly after the US government promised a 'proportional response' to the Sony Pictures hack, which the FBI believes was carried out by North Korea. While it would be rather funny if the US government was responsible for taking North Korea off the internet, it's more likely to be the actions of some disgruntled hacktivists such as Anonymous or Lizard Squad.