I know about one old thread that might be interesting: community/forums/topics/28263?n=1
In that thread, you can see that the creator of the thread (Hanyuu) asked some questions about mapping meant for the future. You can then see the anonymous (anonymous_old) account talking.What's more interesting is that the anonymous account was created on August 2007, while osu! (and by extension the website and forums) was released on September 2007. How could the anonymous account have been created before osu! was even released?
In that thread, you can see that the creator of the thread (Hanyuu) asked some questions about mapping meant for the future. You can then see the anonymous (anonymous_old) account talking.