I would do it the whole [youtube] format, but it doesn't seem to want to go to the part that I told it. So here's the link, a clip from Roger Waters' "The Wall", live in London, towards the end of "Follow the Worms" and just before the famous Hammer March. The animation by Gerald Scarfe is incredible.
http://www.youtube.com/watch?v=ZRCRlp0uyAs#t=5930