Superman knowing batman's language (hum)
I love a headcanon of batman just being a busy humming person and superman being able to understand. Like imagine being so used to someone humming that you start to understand what they mean and you just carry them around like:
(art isnt mine idk who's it is)
Heres an imagined story:
(place: justice meeting place)
Cyborg:for all the information *bla bla bla*
Wonder woman:but who can stop joker? He might be a human but heck hes got violent mind.
Green latern: joker is a no problem for me. I can handle him.
Superman:i think we should let batman handle it. He fought him before and won.
Batman:mhm.
Wonder woman:but what if he fails?
Batman: hm. hm.
Wonder woman:what?
Superman:oh he just said nuh uh.
Flash:what do you mean nuh uh?
Batman:hmmm.. mmh... mhm. HmM... *Dissapears with his batarang*
Superman: batman wait! You cant create an energised mask which is designed to filter out joker's toxic gas and go to the coordination with Your batmobile because flying will get you caught and beat joker up with your bat gadgets and then call green latern to lock him in a green cage and call flash and shazam to clean up the mess and call me and wonder woman to guard the place while you do so! *goes after batman*
Flash:how the f-
Wonder woman: *speechless*
Green latern: guys i think batman spoke kryptonian
Cyborg:did that sound kryptonian to you?!
Manhunter:even my brain cant translate that shi.
Shazam: *shrugs* at least we know the plan.