"The Penguin Declines"
Joker again smuggles Penguin out of prison, and persuades him to help him again by wooing the 'desertress' Venus. He hopes she will be able to get Batman to reveal the location of the Batcave.
Meanwhile, Joker turns all of Gotham City's water into strawberry jelly, which keeps Batman and Robin busy for a while. Joker and Penguin then hide in the Batmobile trunk, and leap out when they are inside the Batcave!
Chief O'Hara wears nothing but a towel as Commissioner Gordon makes a call on the batphone.
No pithy comment could do this justice.