I will take a shot at it:
Its been months after the League of Shadows incident. During that time, Batman has been getting reckless in his hide and seek game with the Joker. Taking down and bulling any underground mob and helpless crooks at his will. Man handling them at his own will and desire.
Leaving the whole Gotham criminals in FEAR of the Dark Knight, they turn to a man they didnt fully understand.
The large majority of the Gotham underground hunt down and leave pleading calls for the Joker to lead them out of the depression of crime.
In doing so, they find him but not as the scarred man we have seen him. Only a normal looking man with no gashes across his face. He agrees to lead them, but he want absolute power. As the mob, not knowing him well, they agree.
First hit, Gotham National Bank(or whatever it was called). They hold up the bank and the people get their first glance at THE JOKER. As some people not taking him seriously at first glance with a purple suit on, he shoots the first man who laughs at him at the bank. Then lets out his Iconic and frighting laugh.
Slapping and kicking the banks customers and tellers as they lay on the ground as he makes his way to the front desk.
Thugs, with clown masks on, armed with guns keeping everyone at bay. Joker, in his calm but yet serious voice ask for the young lady to quickly make his withdraw. As she goes to the vault with a thug to a gun at her back. Joker looks though the young ladies purse, which was behind the counter. Sitting on the counter with his legs crossed, looking very loose but at the same time his eyes watched everyone. Finding a red lipstick and white powder make up. Applying it to his face, while using a pocket mirror in the purse.
The thug returns to the front with the cash and blood on his hands and a dripping bloody knife on his hip.
Joker lowering the mirror, from his face, the thug gets startled from the first glance.
No time for looking at his bosses face, they quickly grabbed the money and left. Upon leaving the building, the enter the fan as quickly as possible but the cops are on their tail. Trying to lose them but the tumbler out of nowhere bowls the fans over. Joker tries to make an escape but batman throws a bat symbol at him, gashing him across the face.
Cops able to stop his running and trap him in a circle of cop cars.
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later.
While, Jim Gordan, Harvey Dent, and Rachel Dawes are ready to take the Joker to court someone is planing to bust joker out.
Scarecrow.
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Jut my little take. I know i went out of bound on stuff but hey its good fun.