There are a number of ways that have been suggested. Possibly by being dropped by Batman in a disfiguring acid. Possibly by self mutilation or being attacked by another individual (the mob, his own father, etc.). There are several different supposed origins in the comics and films.
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2. Joke-r
I think in Batman begins, its a realy good movie!
Av8r haha what a joker
There are usually two joker cards in a deck of playing cards. They can used to replace a damaged, soiled or lost playing card or included in games like Old Maid.