Chances are, you were on my user page or talk page and asked yourself, "What is up with MG's avatar???" Well, now you will know.
A year ago, I started creating a pinball adventure video game on paper. I needed a final boss. I noticed my game had no sense of humor. Since I am insane (and proud of it), I decided to make the final boss look totally out of place. It was a floating cartoon face. OF DARKNESS! It eventually got named Dartoon. (Dark+Cartoon, it is that simple)
So there you have it, the answer to that question.