When I was a kid I got an audiotape/comic book combo containing the story "The Untold Legend of the Batman." It was a sort of off reboot of the Batman mythos and since has been ret-conned, pretty sure. The story was ripe with weird revelatory moments and plot twists. Since this origin story has all but been erased from his history, this is a really cool Batman tale. You can hear the audio below, its pretty interesting!