The Killing Joke
What an amazing story! This has got to be one of my favorite comic books of all time. It defines the relationship between Joker and Batman. Heath's Joker was inspired by these comic (along other ones aswell).
So I wanted to re-create these scene in particular when Joker shoots Barbara Gordon.
If you haven't read these comic yet, then do it!!!
Joker and Harley [link]