That would be cool. Bruce has a mind control-induced out-of-body experience when he transforms and can only watch helplessly as the Hulk attacks everything around him.

It's alluded to in the story:*

I thought the point of Killing Joke is that the Joker wasn't an average dude who snapped and he just made that up as a warped justification for his horrible behavior. He was probably a sick person long before he became the Joker. His "one bad day" hypothesis is disproven by Jim Gordon staying sane after being…

The post-credits scene tradition started in The Incredible Hulk. Anyone remember that movie? I wish I didn't.