Some time in the early seventies or late sixties, there was an animated short film which was a black blotch on a movie screen and the voice of an older jewish man saying that it looked like a cockroach. I think the voice over was done by mel brooks but I can't find any reference to this short. It may even have been a National Film Board short. Does anyone know it?

Hey - think I found it, try this:
Mel Brooks The Critic - YouTube (http://www.youtube.com/watch?v=DiYjwRZK_NM)