Incognito
Banned
Not sure how true it is, but here is an interesting factoid from TV Tropes
http://tvtropes.org/pmwiki/pmwiki.php/Main/JokerImmunity
http://tvtropes.org/pmwiki/pmwiki.php/Main/JokerImmunity
Assuming this is true, what would happen to the Batman comics if there was no last-minute editing and the Joker remained as a one-off villain? How would the comic-book industry evolve without one of its most widely-recognized villains? Would anyone else fill the role of Batman's main nemesis in a world without Joker?...He (the Joker) was originally conceived as a one-off villain (co-creator Bill Finger worried that Batman, and law enforcement would look pretty incompetent if the villains kept escaping prison), and Batman didn't even have his no-kill code back in those early days, but the Joker proved too good a villain to waste by killing after one issue so a last minute edit had him survive.