That Vader scream at the end of ROTS that everybody hates: the first thing I thought after hearing it was that the scream of rage sounded far more convincing in the "Vader vs. the Energizer Bunny" commercial where Vader's lightsaber fails and he opens it up to find cheapo batteries!
So, if you want to edit that scene, use the scream out of that commercial. I believe it's even James Earl Jones' voice.
--SKot