I had this really good costume lined up for a ball I was going to go to, but then the theme that was announced didn't accommodate it even loosely (it was "Sporty and Spicey").
I was going to go as Dr Manhattan, I had white contacts, lots of blue body paint and recently shaved my head (for shave for a cure). I was going to use a marker on my head for the hydrogen symbol and wear a suit. As the night wore on I was going to take off more and more clothing until I was running around in nothing but blue underwear (with a simple penis like in the comics drawn on it).