Darth Vader didn't scream "NOOOOO!" like he was doing a bad rendition of Oedipus,
Ghunter see this video on "a defense for Vader's NO" and I think it does make since.
http://www.youtube.com/watch?v=6WL_frP2PzM
We grew up with a "bad a****" vader that was cruel and cold. But as we find out in E1-E3 Vader was NOT always like that.
Anikan was NOT born evil you know. I guess I see the "no" as the anikan that was inside Vader. Even the devil can cry you know.
-Jedi