"Scat! Darn Catwoman"
After taking Catwoman's drug, Batman helps her get the plans to the Gotham City Mint. He later reveals he was only pretending to be evil the whole time, as he had taken a Bat-antidote pill before she administered the drug. He figured this was a good way to determine if the Mint had any flaws in its security system design.
Fearing Batman has gone bad, Gordon tries to trace the line to the Batphone, but the Diversionary Batphone Lines lead him to the apartment of Pat Pending. Gordon and O'Hara are instantly convinced that the rather large old man is indeed Batman. When Pending tries to argue that they've made a mistake, Gordon responds, "You're very clever, Batman."
Robin's about to cut Batman in two!