A parody drawn in my sketchbook, while on the Chicago set of "The Dark Knight" for two fun-filled days...I passed the original off to a crew member, so maybe it's sitting in a pile on Christopher Nolan's desk. I hope.
During my early years of Kung Fu practice, I kept an extensive sketchbook, attempting to retain the subtleties of what my old-school Cantonese teacher had shown. Doing this taught me a lot about how to observe human movement with a keen eye.