Batman headcanon that the members of the batfam use heroes, villains, police officers, random citizens to communicate with each other over the city. They have radios, but they have much more fun passing messages through middle men.
Red Hood creeps up behind Bullock. “Tell Red Robin that he needs to pick up more ice cream. Me, Batgirl and the Demon finished it all during our last Dead Robin Meeting.” Bullock is so confused? Why does he care? Why would he even see Red Robin?? But somehow he does run into kid, and he reluctantly passes on the message. And is forced to watch the vigilante rage over the fact that he’d been saving that ice cream.
Harley is handcuffed on the way to the station when Nightwing jumps onto the roof of the car, he leans down so he’s looking at her through the back window with a dark, serious face. “Tell the Bat I am not speaking to him, I will never work with him or even look at his face again if he doesn’t apologize.” And then he’s gone. Batman is there to see that Harley is placed in her cell and is rubbing at his temples are Harley relays the ultimatum. All this because he made an off-hand comment about his Discowing costume?
A college student is walking home from class and sees Robin kneeling over a box in the street. Curiously, he approaches and sees it’s full of sad wet kittens. Robin looks up at him. “If you see the others, tell them we need 4 bags of cat food, some cat beds, and more blankets." He then disappears with the box. The student flags down one of the Batgirls. At 3am they are awakened by a shout across the city "I said no more cats!”
Superman is sipping coffee up in the Watchtower, it is very peaceful when all of a sudden. He hears his name being shouted in Gotham. His heart clenches and he flies there so fast, is someone hurt? Are they in trouble? He arrives to find Tim sitting on his bed with a bored expression. “Hey Mr. Kent, could you tell Conner that while I enjoyed that meme he sent me, he used it incorrectly.” Superman blinks. “Thanks, my phone is charging downstairs and I didn’t feel like getting it.” He looks up and smiles, “hey is that coffee?”
Two-Face has been apprehended by Black Bat. As she handcuffes him and waits for the police, she taps his shoulder and mimes out a few things, with a word or two every now and again. He has no idea what’s happening. When Batgirl and Robin come to haul him away, Two-Face grudgingly admits that Black Bat had something to tell them. He wiggles his shoulders and makes the hand motions he’d seen the young girl do before. Batgirl suddenly screams and run away. “I knew I was forgetting something! I forgot to put a timer on my cake! Call the cave before the house starts on fire!"