It was so common that "something cd key" was a common search term. And people would put that in the wrong input box/window such that they would end up typing that in chat rooms. In some of those, people would reply with the same "something cd key" followed with "to you too", as if it were some form of greetings. Later on, people would show up saying "something random cd key" as an actual form of greeting, not a mistake.