| Synopsis | - A subway train rushes by in Gotham City one fine morning. In a nearby bank, an old woman bank teller is putting away bags of money into the vault. A friendly security guard greets her, but the woman lets out a giggle. She excuses herself and walks into the vault. The woman begins to laugh insanely inside the vault. The guard looks inside, only to be hit by a runaway money cart the old lady is riding. The guard yells to her, but the woman simply turns around to expose an insane expression on her face. The lady rides around the bank, throwing money in the air aimlessly.
The crazy lady rides out of the bank on the cart, still laughing. Suddenly, Batman arrives to stop the cart. The woman continues to laugh, grabs two sacks of money, and begins to run. She is again stopped by Robin. The lady runs around the boy and is then stopped by Batgirl. The lady, still not caught, is finally taken down by a bola from Batgirl.
Batman walks over to the lady, still laughing hysterically, and examines her. Obviously the work of the Joker. Batman turns around to find that the woman is not the only one laughing and stealing. All over town, there are dozens of robberies being perpetrated by crazily laughing citizens.
That night, Batman is standing on the GCPD Building's roof with James Gordon. Batman tells Gordon of his attempts to stop all the robberies, but they were too scattered. There was no obvious pattern. Gordon explains that he had his men try to stop the robberies themselves, too. Gordon tells Batman that those who did the robberies explained that they have no idea why they did it or how they were hypnotized. None of the victims have anything in common.
In the alleyway below, Robin and Batgirl are waiting for their leader to finish his conversation with Gordon. Their conversation is interrupted when Batgirl randomly begins to chuckle. Robin realizes with horror that she, too, has become infected.
An alarm begins to sound below. Both Batman and Gordon look to see the jewerly store under attack with Batgirl and Robin in pursuit. But, unknown to Batman, is that Robin is the one in pursuit of the infected Batgirl.
Robin and Batgirl have a brief dual with Batgirl being the victorious one. The battle ends with Robin hanging on to his Batrope on the edge of a bridge. Batgirl takes out her sharp Batarang and prepares to cut the rope and Robin's life.
Before she gets the chance to kill the sidekick, Batman arrives and scolds her. Batgirl tries to attack the hero, but he is too quick. He takes out an antidote canister from his utility belt and sprays Batgirl in the face. Instantly, the girl stops attack and falls to the floor. Robin ascends back to the top of the bridge to regroup with Batman.
Batgirl, now fully recovered, does not remember her robbery. Batman has to tell her what happened. Batgirl looks at her stolen jewerly and states she doesn't even like pearls. The Dark Knight asks the girl is she remembers where she was taking the jewerly. She does not but looks into the distance and states she might know, though.
In the river the bridge goes over, the [[W:C:DC:Joker
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