When the Penguin is knocked down by Robin, he tries to reach for his umbrella but Batman stops him, then the Penguin begins slamming his fists on the ground.
Joker's plot in the second story is to steal the original score of Ruggero Leoncavallo's, "Pagliacci" and 1892 opera that often shows up in Batman media. Penguin and Veronica Vreeland previously attended the opera.