Originally Posted by BlueLightning
I like to believe that the story with the wife was mostly true, if only to strengthen the bond with the Killing Joke.
TKJ also created the multiple origin idea: "Sometimes I remember it one way, sometimes another. If I have to have a past, I prefer it be multiple choice!"
The book suggests an origin, but in the climax that gets flipped on it's head and the reader is left to wonder if it was all bogus. I find that liberating.
It's also the most potent summary of just what kind of crazy the Joker really is.