Batman and Superman undercover (as their civilian selves) on official Justice League business…

Bruce: Nice room.

Clark: I took the liberty of booking the whole floor. Your card.

Bruce: Guess I can use the miles. 

Teaming up with the World’s Greatest Detective be like…

Green Arrow: So, what now? We go back to the Falcone house and talk to the servants more?

Batman: Hn. You’re doing it again.Talking.

Green Arrow: What? I’m not supposed to talk?

Batman: Situations like these cases require my total concentration. I talk to you, never the other way around.

Batman: You know, Superman, I take it all back. I’m beginning to find your companionship extremely useful.

Superman: *grins proudly*

Batman: It’s like white noise. It puts me in a state where I think and observe better.

Superman: How do you do it, guess things?

Batman: I observe, and then I deduce.

Superman: How did you know I was a farmer? You said you could tell from my hand.

Batman: Hands, plural. It had calluses, not soft.

Superman: How did you know my family was Kryptonian?

Batman: Google. Not everything is deducible.

Welcoming new members into the Justice League…

Batman: We will get along just fine.

Batman: Though hopefully not too fine, because I am not looking for any new friends. End speech.

Green Lantern (Hal): Woohoo! Well said, Bats!