Sketch - Rage Caveman

Today there was an old man painting this scene.  I don't think I was as cliche looking when I sketched this; possibly just crazy.  I gripped the pencil caveman style (knife grip horror movie style) and flexed my arm as much as I could to vibrate my hand.  As I rapidly scratched the page, I periodically used the blunt end of the pencil to add dark smudges for things in a series (windows).  I think the smudges are actually the coating of the pencil, not the graphite.