So I tend to be at work a little bit early. My commute is pretty long and since I never know when there's going to be heavy traffic, I just leave the house early. On days when I don't have a project to work on yet, I tend to do my own thing when I arrive there. On some days I'll try to do as many quick speed paint/sketches before our project meetings. This was one of them.
The same day I did this, I had a couple minutes to kill at the end of the day so I decided to do a more simplified version of this sketch. I finally had time today to vector it in flash.