The Joker and his henchmen beat a harried retreat, just as the cops arrive in time to cut Batman and Robin out from the electric chairs before the power comes back on.
After replaying the audiotape Batman secretly made while in the van, they were able to make out Susie as one of the members of the Joker's crime family, much to Robin's shock and dismay as he had romantic feelings for her.
Batman and Robin enter the bar, trigger the gimmicked jukebox which reveals a double-barrel shotgun, deflect its bullets with a Batshield, and use a bomb to destroy the armed machine.
They then realize that Susie is in danger and rush to her aid, just as Joker, realizing that Batman is on to Susie, gives her some "imported" Canadian perfume (called Une Nuit Sans Fin (One Endless Night)), which he instructs her to use only after she has planted answers to some important nationwide pre-college exam papers she stole inside one of the rigged machines, not telling her that the perfume has been poisoned.
Batman and Robin suddenly announce themselves from the rafters to inform the students that the exam papers were counterfeit which they planted, rendering the Joker's photo evidence useless.