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In the recently released Batman movie "The Killing Joke", the writers shocked viewers while attempting to add romantic depth to Bruce and Barbara's relationship. The scene that people found most shocking was the scene where Batman and Batgirl go from arguing to fighting to hooking upon a rooftop. This is especially creepy when Batgirl's main relationship in the comics is with Dick Grayson, Batman's adopted son.

Creepiness aside, is there any precedent for this relationship. From what I have heard or read it seems like the writers took it from somewhere, but I am not sure from where.

Are there any other examples of a Batman - Batgirl relationship besides the one given in "The Killing Joke Movie"

In the recently released Batman movie "The Killing Joke", the writers shocked viewers while attempting to add romantic depth to Bruce and Barbara's relationship. The scene that people found most shocking was the scene where Batman and Batgirl go from arguing to fighting to hooking up on a rooftop. This is especially creepy when Batgirl's main relationship in the comics is with Dick Grayson, Batman's adopted son.

Creepiness aside, is there any precedent for this relationship? From what I have heard or read it seems like the writers took it from somewhere, but I am not sure from where.

Are there any other examples of a Batman - Batgirl relationship besides the one given in "The Killing Joke Movie"?