I remember watching the cutscene where Riku introduced himself as Ansem to DiZ, I literally semiyelled at my T.V. "You're supposed to be dead! I killed you already so get back in the grave!" just cause the first time I played KH it took me forever to kill Ansem so I thought wouldn't see him again.
The scene where I found out it was actually Xehanort's Heartless, I was like "...Great, going Sora, you killed somebody you didn't even know and now the cops are going to come after you" I seriously didn't expect that to happen. I thought Xehanort was Ansem. I didn't really think AtW was DiZ either, I thought he was the glowy eyed "Unknown" on Deep Dive, just in an Organization coat <--- Has never played CoM.