Producers, The (2005) Easter Egg - "Join the Nazi Party"

During the actual play, an actor steps on stage and says,"don't be stupid, be a smarty. Come and join the nazi party." That's not the actors voice. If you listen closely and pay attention...It's Mel Brooks voice. A few seconds later you hear the actor's real voice and it is much deeper. This voice over is Mel Brooks' cameo, since he doesn't appear in the movie, yet he makes a cameo in every other movie he made.