I finally figured it out - there was someone dressed in a hooded robe with a mirror face in the Village Halloween parade and when I saw it I thought - "what movie have I seen this in before???"
See for yourself:
I finally remembered today - in art college they showed us Meshes of an Afternoon - I haven't thought of that movie since art college - but that crazy mirror-face character stuck in my mind.
Not only can you watch "Meshes" in its entirety for free on Google video, you can also watch the infamous Un Chien Andalou - infamous because of the cut eyeball imagery; Eraserhead; Nosferatu; The Cabinet of Dr. Caligari; Night of the Living Dead; AND Kenneth Anger's "Inauguration of the Pleasure Dome" featuring Anais Nin.
Yoko Ono's "Cut Piece" is also available!