I downloaded v0002 near the end of its life when I was 11 and for some reason I had all these issues with it. I couldn't manage to join a server or change my name. When Retail came out and I figured out how to change my name, I was so used to Blockdude that I wanted to keep it, but Blockdude must have been taken or something and Blockheads were looked down on, so I went with Mr.Block. Then one day in 2008, I joined an rp and there was a serious mutant outbreak going on, and they needed doctors to contain the infection. So I became a doctor and realized that Dr.Block was slightly more original than Mr.Block and kept it forever.
Under both of those names, I have been mistaken for other users who have accomplished more in this game than I have. (But I totally had it first)