John Carmack has a tendency to pop up and actually comment whenever he or Doom are mentioned somewhere. Another example: http://kotaku.com/thanks-a-few-comment

John Carmack has a tendency to pop up and actually comment whenever he or Doom are mentioned somewhere. Another example: http://kotaku.com/thanks-a-few-comments-in-some-ways-i-still-think-the-454293019 http://kotaku.com/thanks-a-few-comments-in-some-ways-i-still...